Loans and Allowances for Credit Losses, Troubled Debt Restructurings, Modifications (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	$ 22,041	$ 10,665
Troubled Debt Restructurings, Recorded Balance With Payment Default	25,563	28,743
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	13,242	525
Troubled Debt Restructurings, Recorded Balance With Payment Default	5,646	2,829
Commercial | Energy [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	13,242	525
Troubled Debt Restructurings, Recorded Balance With Payment Default	5,646	2,829
Commercial | 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
Commercial | 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
Commercial | 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 | 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
Commercial | 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
Commercial real estate
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 | 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
Commercial real estate | 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 | 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 | 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 | 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 | 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
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	8,795	10,130
Troubled Debt Restructurings, Recorded Balance With Payment Default	19,917	25,914
Residential mortgage | Permanent mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	47	429
Troubled Debt Restructurings, Recorded Balance With Payment Default	678	1,597
Residential mortgage | Permanent mortgages guaranteed by US government agencies [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	8,093	9,079
Troubled Debt Restructurings, Recorded Balance With Payment Default	18,242	23,952
Residential mortgage | Home equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	655	622
Troubled Debt Restructurings, Recorded Balance With Payment Default	997	365
Personal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	4	10
Troubled Debt Restructurings, Recorded Balance With Payment Default	0	0
Accruing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	7,912	8,989
Troubled Debt Restructurings, Recorded Balance With Payment Default	17,106	22,606
Accruing [Member] | Commercial
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 | 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 | 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 | 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 | 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 | 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 | 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
Accruing [Member] | Commercial | Other commercial real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance With Payment Default		0
Accruing [Member] | Commercial real estate
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 | 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 | 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 | 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 | 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 | 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 | 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] | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	7,912	8,989
Troubled Debt Restructurings, Recorded Balance With Payment Default	17,106	22,606
Accruing [Member] | Residential mortgage | 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 | Permanent mortgages guaranteed by US government agencies [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	7,912	8,989
Troubled Debt Restructurings, Recorded Balance With Payment Default	17,106	22,606
Accruing [Member] | Residential mortgage | 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] | Personal
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] | Payment Stream [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	5,885	4,331
Accruing [Member] | Payment Stream [Member] | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Accruing [Member] | Payment Stream [Member] | Commercial | Energy [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Accruing [Member] | Payment Stream [Member] | Commercial | Services [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Accruing [Member] | Payment Stream [Member] | Commercial | Wholesale/retail [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Accruing [Member] | Payment Stream [Member] | Commercial | Manufacturing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Accruing [Member] | Payment Stream [Member] | Commercial | Healthcare [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Accruing [Member] | Payment Stream [Member] | Commercial | Other commercial and industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Accruing [Member] | Payment Stream [Member] | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Accruing [Member] | Payment Stream [Member] | Commercial real estate | 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
Accruing [Member] | Payment Stream [Member] | Commercial real estate | Retail [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Accruing [Member] | Payment Stream [Member] | Commercial real estate | Office [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Accruing [Member] | Payment Stream [Member] | Commercial real estate | Multifamily [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Accruing [Member] | Payment Stream [Member] | Commercial real estate | Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Accruing [Member] | Payment Stream [Member] | Commercial real estate | Other commercial real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Accruing [Member] | Payment Stream [Member] | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	5,885	4,331
Accruing [Member] | Payment Stream [Member] | Residential mortgage | Permanent mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Accruing [Member] | Payment Stream [Member] | Residential mortgage | Permanent mortgages guaranteed by US government agencies [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	5,885	4,331
Accruing [Member] | Payment Stream [Member] | Residential mortgage | Home equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Accruing [Member] | Payment Stream [Member] | Personal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Accruing [Member] | Combination & Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	2,027	4,658
Accruing [Member] | Combination & Other [Member] | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Accruing [Member] | Combination & Other [Member] | Commercial | Energy [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Accruing [Member] | Combination & Other [Member] | Commercial | Services [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Accruing [Member] | Combination & Other [Member] | Commercial | Wholesale/retail [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Accruing [Member] | Combination & Other [Member] | Commercial | Manufacturing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Accruing [Member] | Combination & Other [Member] | Commercial | Healthcare [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Accruing [Member] | Combination & Other [Member] | Commercial | Other commercial and industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Accruing [Member] | Combination & Other [Member] | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Accruing [Member] | Combination & Other [Member] | Commercial real estate | 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
Accruing [Member] | Combination & Other [Member] | Commercial real estate | Retail [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Accruing [Member] | Combination & Other [Member] | Commercial real estate | Office [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Accruing [Member] | Combination & Other [Member] | Commercial real estate | Multifamily [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Accruing [Member] | Combination & Other [Member] | Commercial real estate | Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Accruing [Member] | Combination & Other [Member] | Commercial real estate | Other commercial real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Accruing [Member] | Combination & Other [Member] | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	2,027	4,658
Accruing [Member] | Combination & Other [Member] | Residential mortgage | Permanent mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Accruing [Member] | Combination & Other [Member] | Residential mortgage | Permanent mortgages guaranteed by US government agencies [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	2,027	4,658
Accruing [Member] | Combination & Other [Member] | Residential mortgage | Home equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Accruing [Member] | Combination & Other [Member] | Personal
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	14,129	1,676
Troubled Debt Restructurings, Recorded Balance With Payment Default	8,457	6,137
Nonaccrual [Member] | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	13,242	525
Troubled Debt Restructurings, Recorded Balance With Payment Default	5,646	2,829
Nonaccrual [Member] | Commercial | Energy [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	13,242	525
Troubled Debt Restructurings, Recorded Balance With Payment Default	5,646	2,829
Nonaccrual [Member] | Commercial | 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
Nonaccrual [Member] | Commercial | 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
Nonaccrual [Member] | Commercial | 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 | 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
Nonaccrual [Member] | Commercial | 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
Nonaccrual [Member] | Commercial real estate
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 | 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
Nonaccrual [Member] | Commercial real estate | 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 | 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 | 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 | 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 | 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] | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	883	1,141
Troubled Debt Restructurings, Recorded Balance With Payment Default	2,811	3,308
Nonaccrual [Member] | Residential mortgage | Permanent mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	47	429
Troubled Debt Restructurings, Recorded Balance With Payment Default	678	1,597
Nonaccrual [Member] | Residential mortgage | Permanent mortgages guaranteed by US government agencies [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	181	90
Troubled Debt Restructurings, Recorded Balance With Payment Default	1,136	1,346
Nonaccrual [Member] | Residential mortgage | Home equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	655	622
Troubled Debt Restructurings, Recorded Balance With Payment Default	997	365
Nonaccrual [Member] | Personal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	4	10
Troubled Debt Restructurings, Recorded Balance With Payment Default	0	0
Nonaccrual [Member] | Payment Stream [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	13,382	892
Nonaccrual [Member] | Payment Stream [Member] | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	13,242	525
Nonaccrual [Member] | Payment Stream [Member] | Commercial | Energy [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	13,242	525
Nonaccrual [Member] | Payment Stream [Member] | Commercial | Services [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Nonaccrual [Member] | Payment Stream [Member] | Commercial | Wholesale/retail [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Nonaccrual [Member] | Payment Stream [Member] | Commercial | Manufacturing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Nonaccrual [Member] | Payment Stream [Member] | Commercial | Healthcare [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Nonaccrual [Member] | Payment Stream [Member] | Commercial | Other commercial and industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Nonaccrual [Member] | Payment Stream [Member] | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Nonaccrual [Member] | Payment Stream [Member] | Commercial real estate | 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
Nonaccrual [Member] | Payment Stream [Member] | Commercial real estate | Retail [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Nonaccrual [Member] | Payment Stream [Member] | Commercial real estate | Office [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Nonaccrual [Member] | Payment Stream [Member] | Commercial real estate | Multifamily [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Nonaccrual [Member] | Payment Stream [Member] | Commercial real estate | Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Nonaccrual [Member] | Payment Stream [Member] | Commercial real estate | Other commercial real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Nonaccrual [Member] | Payment Stream [Member] | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	140	367
Nonaccrual [Member] | Payment Stream [Member] | Residential mortgage | Permanent mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	16	367
Nonaccrual [Member] | Payment Stream [Member] | Residential mortgage | Permanent mortgages guaranteed by US government agencies [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Nonaccrual [Member] | Payment Stream [Member] | Residential mortgage | Home equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	124	0
Nonaccrual [Member] | Payment Stream [Member] | Personal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Nonaccrual [Member] | Combination & Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	747	784
Nonaccrual [Member] | Combination & Other [Member] | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Nonaccrual [Member] | Combination & Other [Member] | Commercial | Energy [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Nonaccrual [Member] | Combination & Other [Member] | Commercial | Services [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Nonaccrual [Member] | Combination & Other [Member] | Commercial | Wholesale/retail [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Nonaccrual [Member] | Combination & Other [Member] | Commercial | Manufacturing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Nonaccrual [Member] | Combination & Other [Member] | Commercial | Healthcare [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Nonaccrual [Member] | Combination & Other [Member] | Commercial | Other commercial and industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Nonaccrual [Member] | Combination & Other [Member] | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Nonaccrual [Member] | Combination & Other [Member] | Commercial real estate | 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
Nonaccrual [Member] | Combination & Other [Member] | Commercial real estate | Retail [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Nonaccrual [Member] | Combination & Other [Member] | Commercial real estate | Office [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Nonaccrual [Member] | Combination & Other [Member] | Commercial real estate | Multifamily [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Nonaccrual [Member] | Combination & Other [Member] | Commercial real estate | Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Nonaccrual [Member] | Combination & Other [Member] | Commercial real estate | Other commercial real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	0	0
Nonaccrual [Member] | Combination & Other [Member] | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	743	774
Nonaccrual [Member] | Combination & Other [Member] | Residential mortgage | Permanent mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	31	62
Nonaccrual [Member] | Combination & Other [Member] | Residential mortgage | Permanent mortgages guaranteed by US government agencies [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	181	90
Nonaccrual [Member] | Combination & Other [Member] | Residential mortgage | Home equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	531	622
Nonaccrual [Member] | Combination & Other [Member] | Personal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings, Recorded Balance Modified During The Period	$ 4	$ 10