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Loans and Allowances for Credit Losses, Troubled Debt Restructurings, Modifications (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period $ 52,459 $ 48,420
Troubled Debt Restructurings, Recorded Balance With Payment Default 27,528 34,262
Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 25,995 10,611
Troubled Debt Restructurings, Recorded Balance With Payment Default 8,593 38
Commercial [Member] | Energy [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 16,892 2,304
Troubled Debt Restructurings, Recorded Balance With Payment Default 8,593 0
Commercial [Member] | Services [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 7,577
Troubled Debt Restructurings, Recorded Balance With Payment Default 0 0
Commercial [Member] | Wholesale/retail [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 9,103 0
Troubled Debt Restructurings, Recorded Balance With Payment Default 0 0
Commercial [Member] | Manufacturing [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Troubled Debt Restructurings, Recorded Balance With Payment Default 0 0
Commercial [Member] | Healthcare [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 673
Troubled Debt Restructurings, Recorded Balance With Payment Default 0 0
Commercial [Member] | Other commercial and industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 57
Troubled Debt Restructurings, Recorded Balance With Payment Default 0 38
Commercial Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 329
Troubled Debt Restructurings, Recorded Balance With Payment Default 0 329
Commercial Real Estate [Member] | Residential construction and land development [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 329
Troubled Debt Restructurings, Recorded Balance With Payment Default 0 329
Commercial Real Estate [Member] | Retail [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Troubled Debt Restructurings, Recorded Balance With Payment Default 0 0
Commercial Real Estate [Member] | Office [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Troubled Debt Restructurings, Recorded Balance With Payment Default 0 0
Commercial Real Estate [Member] | Multifamily [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Troubled Debt Restructurings, Recorded Balance With Payment Default 0 0
Commercial Real Estate [Member] | Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Troubled Debt Restructurings, Recorded Balance With Payment Default 0 0
Commercial Real Estate [Member] | Other commercial real estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Troubled Debt Restructurings, Recorded Balance With Payment Default 0 0
Residential Mortgage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 26,387 37,365
Troubled Debt Restructurings, Recorded Balance With Payment Default 18,930 33,882
Residential Mortgage [Member] | Permanent mortgage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 1,364 4,055
Troubled Debt Restructurings, Recorded Balance With Payment Default 544 3,034
Residential Mortgage [Member] | Permanent mortgages guaranteed by U.S. government agencies [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 22,900 31,202
Troubled Debt Restructurings, Recorded Balance With Payment Default 17,801 30,324
Residential Mortgage [Member] | Home equity [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 2,123 2,108
Troubled Debt Restructurings, Recorded Balance With Payment Default 585 524
Personal [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 77 115
Troubled Debt Restructurings, Recorded Balance With Payment Default 5 13
Accruing [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 21,921 28,101
Troubled Debt Restructurings, Recorded Balance With Payment Default 17,154 27,223
Accruing [Member] | Payment Stream [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 11,879 17,717
Accruing [Member] | Combination & Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 10,042 10,384
Accruing [Member] | Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Troubled Debt Restructurings, Recorded Balance With Payment Default 0 0
Accruing [Member] | Commercial [Member] | Payment Stream [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Accruing [Member] | Commercial [Member] | Combination & Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Accruing [Member] | Commercial [Member] | Energy [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Troubled Debt Restructurings, Recorded Balance With Payment Default 0 0
Accruing [Member] | Commercial [Member] | Energy [Member] | Payment Stream [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Accruing [Member] | Commercial [Member] | Energy [Member] | Combination & Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Accruing [Member] | Commercial [Member] | Services [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Troubled Debt Restructurings, Recorded Balance With Payment Default 0 0
Accruing [Member] | Commercial [Member] | Services [Member] | Payment Stream [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Accruing [Member] | Commercial [Member] | Services [Member] | Combination & Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Accruing [Member] | Commercial [Member] | Wholesale/retail [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Troubled Debt Restructurings, Recorded Balance With Payment Default 0 0
Accruing [Member] | Commercial [Member] | Wholesale/retail [Member] | Payment Stream [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Accruing [Member] | Commercial [Member] | Wholesale/retail [Member] | Combination & Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Accruing [Member] | Commercial [Member] | Manufacturing [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Troubled Debt Restructurings, Recorded Balance With Payment Default 0 0
Accruing [Member] | Commercial [Member] | Manufacturing [Member] | Payment Stream [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Accruing [Member] | Commercial [Member] | Manufacturing [Member] | Combination & Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Accruing [Member] | Commercial [Member] | Healthcare [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Troubled Debt Restructurings, Recorded Balance With Payment Default 0 0
Accruing [Member] | Commercial [Member] | Healthcare [Member] | Payment Stream [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Accruing [Member] | Commercial [Member] | Healthcare [Member] | Combination & Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Accruing [Member] | Commercial [Member] | Other commercial and industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Troubled Debt Restructurings, Recorded Balance With Payment Default 0 0
Accruing [Member] | Commercial [Member] | Other commercial and industrial [Member] | Payment Stream [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Accruing [Member] | Commercial [Member] | Other commercial and industrial [Member] | Combination & Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Accruing [Member] | Commercial Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Troubled Debt Restructurings, Recorded Balance With Payment Default 0 0
Accruing [Member] | Commercial Real Estate [Member] | Payment Stream [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Accruing [Member] | Commercial Real Estate [Member] | Combination & Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Accruing [Member] | Commercial Real Estate [Member] | Residential construction and land development [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Troubled Debt Restructurings, Recorded Balance With Payment Default 0 0
Accruing [Member] | Commercial Real Estate [Member] | Residential construction and land development [Member] | Payment Stream [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Accruing [Member] | Commercial Real Estate [Member] | Residential construction and land development [Member] | Combination & Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Accruing [Member] | Commercial Real Estate [Member] | Retail [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Troubled Debt Restructurings, Recorded Balance With Payment Default 0 0
Accruing [Member] | Commercial Real Estate [Member] | Retail [Member] | Payment Stream [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Accruing [Member] | Commercial Real Estate [Member] | Retail [Member] | Combination & Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Accruing [Member] | Commercial Real Estate [Member] | Office [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Troubled Debt Restructurings, Recorded Balance With Payment Default 0 0
Accruing [Member] | Commercial Real Estate [Member] | Office [Member] | Payment Stream [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Accruing [Member] | Commercial Real Estate [Member] | Office [Member] | Combination & Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Accruing [Member] | Commercial Real Estate [Member] | Multifamily [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Troubled Debt Restructurings, Recorded Balance With Payment Default 0 0
Accruing [Member] | Commercial Real Estate [Member] | Multifamily [Member] | Payment Stream [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Accruing [Member] | Commercial Real Estate [Member] | Multifamily [Member] | Combination & Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Accruing [Member] | Commercial Real Estate [Member] | Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Troubled Debt Restructurings, Recorded Balance With Payment Default 0 0
Accruing [Member] | Commercial Real Estate [Member] | Industrial [Member] | Payment Stream [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Accruing [Member] | Commercial Real Estate [Member] | Industrial [Member] | Combination & Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Accruing [Member] | Commercial Real Estate [Member] | Other commercial real estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Troubled Debt Restructurings, Recorded Balance With Payment Default 0 0
Accruing [Member] | Commercial Real Estate [Member] | Other commercial real estate [Member] | Payment Stream [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Accruing [Member] | Commercial Real Estate [Member] | Other commercial real estate [Member] | Combination & Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Accruing [Member] | Residential Mortgage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 21,921 28,101
Troubled Debt Restructurings, Recorded Balance With Payment Default 17,154 27,223
Accruing [Member] | Residential Mortgage [Member] | Payment Stream [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 11,879 17,717
Accruing [Member] | Residential Mortgage [Member] | Combination & Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 10,042 10,384
Accruing [Member] | Residential Mortgage [Member] | Permanent mortgage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Troubled Debt Restructurings, Recorded Balance With Payment Default 0 0
Accruing [Member] | Residential Mortgage [Member] | Permanent mortgage [Member] | Payment Stream [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Accruing [Member] | Residential Mortgage [Member] | Permanent mortgage [Member] | Combination & Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Accruing [Member] | Residential Mortgage [Member] | Permanent mortgages guaranteed by U.S. government agencies [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 21,921 28,101
Troubled Debt Restructurings, Recorded Balance With Payment Default 17,154 27,223
Accruing [Member] | Residential Mortgage [Member] | Permanent mortgages guaranteed by U.S. government agencies [Member] | Payment Stream [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 11,879 17,717
Accruing [Member] | Residential Mortgage [Member] | Permanent mortgages guaranteed by U.S. government agencies [Member] | Combination & Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 10,042 10,384
Accruing [Member] | Residential Mortgage [Member] | Home equity [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Troubled Debt Restructurings, Recorded Balance With Payment Default 0 0
Accruing [Member] | Residential Mortgage [Member] | Home equity [Member] | Payment Stream [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Accruing [Member] | Residential Mortgage [Member] | Home equity [Member] | Combination & Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Accruing [Member] | Personal [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Troubled Debt Restructurings, Recorded Balance With Payment Default 0 0
Accruing [Member] | Personal [Member] | Payment Stream [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Accruing [Member] | Personal [Member] | Combination & Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Nonaccrual [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 30,538 20,319
Troubled Debt Restructurings, Recorded Balance With Payment Default 10,374 7,039
Nonaccrual [Member] | Interest Rate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 730
Nonaccrual [Member] | Payment Stream [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 1,082 4,778
Nonaccrual [Member] | Combination & Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 29,456 14,811
Nonaccrual [Member] | Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 25,995 10,611
Troubled Debt Restructurings, Recorded Balance With Payment Default 8,593 38
Nonaccrual [Member] | Commercial [Member] | Interest Rate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 673
Nonaccrual [Member] | Commercial [Member] | Payment Stream [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Nonaccrual [Member] | Commercial [Member] | Combination & Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 25,995 9,938
Nonaccrual [Member] | Commercial [Member] | Energy [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 16,892 2,304
Troubled Debt Restructurings, Recorded Balance With Payment Default 8,593 0
Nonaccrual [Member] | Commercial [Member] | Energy [Member] | Interest Rate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Nonaccrual [Member] | Commercial [Member] | Energy [Member] | Payment Stream [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Nonaccrual [Member] | Commercial [Member] | Energy [Member] | Combination & Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 16,892 2,304
Nonaccrual [Member] | Commercial [Member] | Services [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 7,577
Troubled Debt Restructurings, Recorded Balance With Payment Default 0 0
Nonaccrual [Member] | Commercial [Member] | Services [Member] | Interest Rate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Nonaccrual [Member] | Commercial [Member] | Services [Member] | Payment Stream [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Nonaccrual [Member] | Commercial [Member] | Services [Member] | Combination & Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 7,577
Nonaccrual [Member] | Commercial [Member] | Wholesale/retail [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 9,103 0
Troubled Debt Restructurings, Recorded Balance With Payment Default 0 0
Nonaccrual [Member] | Commercial [Member] | Wholesale/retail [Member] | Interest Rate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Nonaccrual [Member] | Commercial [Member] | Wholesale/retail [Member] | Payment Stream [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Nonaccrual [Member] | Commercial [Member] | Wholesale/retail [Member] | Combination & Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 9,103 0
Nonaccrual [Member] | Commercial [Member] | Manufacturing [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Troubled Debt Restructurings, Recorded Balance With Payment Default 0 0
Nonaccrual [Member] | Commercial [Member] | Manufacturing [Member] | Interest Rate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Nonaccrual [Member] | Commercial [Member] | Manufacturing [Member] | Payment Stream [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Nonaccrual [Member] | Commercial [Member] | Manufacturing [Member] | Combination & Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Nonaccrual [Member] | Commercial [Member] | Healthcare [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 673
Troubled Debt Restructurings, Recorded Balance With Payment Default 0 0
Nonaccrual [Member] | Commercial [Member] | Healthcare [Member] | Interest Rate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 673
Nonaccrual [Member] | Commercial [Member] | Healthcare [Member] | Payment Stream [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Nonaccrual [Member] | Commercial [Member] | Healthcare [Member] | Combination & Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Nonaccrual [Member] | Commercial [Member] | Other commercial and industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 57
Troubled Debt Restructurings, Recorded Balance With Payment Default 0 38
Nonaccrual [Member] | Commercial [Member] | Other commercial and industrial [Member] | Interest Rate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Nonaccrual [Member] | Commercial [Member] | Other commercial and industrial [Member] | Payment Stream [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Nonaccrual [Member] | Commercial [Member] | Other commercial and industrial [Member] | Combination & Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 57
Nonaccrual [Member] | Commercial Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 329
Troubled Debt Restructurings, Recorded Balance With Payment Default 0 329
Nonaccrual [Member] | Commercial Real Estate [Member] | Interest Rate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Nonaccrual [Member] | Commercial Real Estate [Member] | Payment Stream [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 329
Nonaccrual [Member] | Commercial Real Estate [Member] | Combination & Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Nonaccrual [Member] | Commercial Real Estate [Member] | Residential construction and land development [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 329
Troubled Debt Restructurings, Recorded Balance With Payment Default 0 329
Nonaccrual [Member] | Commercial Real Estate [Member] | Residential construction and land development [Member] | Interest Rate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Nonaccrual [Member] | Commercial Real Estate [Member] | Residential construction and land development [Member] | Payment Stream [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 329
Nonaccrual [Member] | Commercial Real Estate [Member] | Residential construction and land development [Member] | Combination & Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Nonaccrual [Member] | Commercial Real Estate [Member] | Retail [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Troubled Debt Restructurings, Recorded Balance With Payment Default 0 0
Nonaccrual [Member] | Commercial Real Estate [Member] | Retail [Member] | Interest Rate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Nonaccrual [Member] | Commercial Real Estate [Member] | Retail [Member] | Payment Stream [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Nonaccrual [Member] | Commercial Real Estate [Member] | Retail [Member] | Combination & Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Nonaccrual [Member] | Commercial Real Estate [Member] | Office [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Troubled Debt Restructurings, Recorded Balance With Payment Default 0 0
Nonaccrual [Member] | Commercial Real Estate [Member] | Office [Member] | Interest Rate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Nonaccrual [Member] | Commercial Real Estate [Member] | Office [Member] | Payment Stream [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Nonaccrual [Member] | Commercial Real Estate [Member] | Office [Member] | Combination & Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Nonaccrual [Member] | Commercial Real Estate [Member] | Multifamily [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Troubled Debt Restructurings, Recorded Balance With Payment Default 0 0
Nonaccrual [Member] | Commercial Real Estate [Member] | Multifamily [Member] | Interest Rate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Nonaccrual [Member] | Commercial Real Estate [Member] | Multifamily [Member] | Payment Stream [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Nonaccrual [Member] | Commercial Real Estate [Member] | Multifamily [Member] | Combination & Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Nonaccrual [Member] | Commercial Real Estate [Member] | Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Troubled Debt Restructurings, Recorded Balance With Payment Default 0 0
Nonaccrual [Member] | Commercial Real Estate [Member] | Industrial [Member] | Interest Rate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Nonaccrual [Member] | Commercial Real Estate [Member] | Industrial [Member] | Payment Stream [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Nonaccrual [Member] | Commercial Real Estate [Member] | Industrial [Member] | Combination & Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Nonaccrual [Member] | Commercial Real Estate [Member] | Other commercial real estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Troubled Debt Restructurings, Recorded Balance With Payment Default 0 0
Nonaccrual [Member] | Commercial Real Estate [Member] | Other commercial real estate [Member] | Interest Rate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Nonaccrual [Member] | Commercial Real Estate [Member] | Other commercial real estate [Member] | Payment Stream [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Nonaccrual [Member] | Commercial Real Estate [Member] | Other commercial real estate [Member] | Combination & Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Nonaccrual [Member] | Residential Mortgage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 4,466 9,264
Troubled Debt Restructurings, Recorded Balance With Payment Default 1,776 6,659
Nonaccrual [Member] | Residential Mortgage [Member] | Interest Rate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 57
Nonaccrual [Member] | Residential Mortgage [Member] | Payment Stream [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 1,082 4,449
Nonaccrual [Member] | Residential Mortgage [Member] | Combination & Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 3,384 4,758
Nonaccrual [Member] | Residential Mortgage [Member] | Permanent mortgage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 1,364 4,055
Troubled Debt Restructurings, Recorded Balance With Payment Default 544 3,034
Nonaccrual [Member] | Residential Mortgage [Member] | Permanent mortgage [Member] | Interest Rate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Nonaccrual [Member] | Residential Mortgage [Member] | Permanent mortgage [Member] | Payment Stream [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 1,036 3,004
Nonaccrual [Member] | Residential Mortgage [Member] | Permanent mortgage [Member] | Combination & Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 328 1,051
Nonaccrual [Member] | Residential Mortgage [Member] | Permanent mortgages guaranteed by U.S. government agencies [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 979 3,101
Troubled Debt Restructurings, Recorded Balance With Payment Default 647 3,101
Nonaccrual [Member] | Residential Mortgage [Member] | Permanent mortgages guaranteed by U.S. government agencies [Member] | Interest Rate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Nonaccrual [Member] | Residential Mortgage [Member] | Permanent mortgages guaranteed by U.S. government agencies [Member] | Payment Stream [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 1,264
Nonaccrual [Member] | Residential Mortgage [Member] | Permanent mortgages guaranteed by U.S. government agencies [Member] | Combination & Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 979 1,837
Nonaccrual [Member] | Residential Mortgage [Member] | Home equity [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 2,123 2,108
Troubled Debt Restructurings, Recorded Balance With Payment Default 585 524
Nonaccrual [Member] | Residential Mortgage [Member] | Home equity [Member] | Interest Rate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 57
Nonaccrual [Member] | Residential Mortgage [Member] | Home equity [Member] | Payment Stream [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 46 181
Nonaccrual [Member] | Residential Mortgage [Member] | Home equity [Member] | Combination & Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 2,077 1,870
Nonaccrual [Member] | Personal [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 77 115
Troubled Debt Restructurings, Recorded Balance With Payment Default 5 13
Nonaccrual [Member] | Personal [Member] | Interest Rate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Nonaccrual [Member] | Personal [Member] | Payment Stream [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period 0 0
Nonaccrual [Member] | Personal [Member] | Combination & Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled Debt Restructurings, Recorded Balance Modified During The Period $ 77 $ 115