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Past Due Loans, Allowance For Credit Losses, Impaired Loans, and TDRS - Impaired Loans Individually Evaluated by Class (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]    
Recorded Investment in Loans with No Specific Reserve $ 32,885 $ 29,314
Recorded Investment in Loans with a Specific Reserve 18,498 13,336
Unpaid Principal Balance 63,329 53,144
Specific Reserve 3,417 525
Commercial and industrial | Commercial and industrial    
Financing Receivable, Impaired [Line Items]    
Recorded Investment in Loans with No Specific Reserve 24,688 11,579
Recorded Investment in Loans with a Specific Reserve 14,433 13,066
Unpaid Principal Balance 47,700 29,514
Specific Reserve 3,408 507
Commercial and industrial | Agricultural    
Financing Receivable, Impaired [Line Items]    
Recorded Investment in Loans with No Specific Reserve 0 0
Recorded Investment in Loans with a Specific Reserve 0 0
Unpaid Principal Balance 0 0
Specific Reserve 0 0
Commercial real estate    
Financing Receivable, Impaired [Line Items]    
Recorded Investment in Loans with No Specific Reserve 8,197 17,735
Recorded Investment in Loans with a Specific Reserve 4,065 270
Unpaid Principal Balance 15,629 23,630
Specific Reserve 9 18
Commercial real estate | Office, retail, and industrial    
Financing Receivable, Impaired [Line Items]    
Recorded Investment in Loans with No Specific Reserve 7,146 16,287
Recorded Investment in Loans with a Specific Reserve 4,065 0
Unpaid Principal Balance 14,480 21,057
Specific Reserve 9 0
Commercial real estate | Multi-family    
Financing Receivable, Impaired [Line Items]    
Recorded Investment in Loans with No Specific Reserve 395 398
Recorded Investment in Loans with a Specific Reserve 0 0
Unpaid Principal Balance 395 398
Specific Reserve 0 0
Commercial real estate | Construction    
Financing Receivable, Impaired [Line Items]    
Recorded Investment in Loans with No Specific Reserve 0 34
Recorded Investment in Loans with a Specific Reserve 0 0
Unpaid Principal Balance 0 34
Specific Reserve 0 0
Commercial real estate | Other commercial real estate    
Financing Receivable, Impaired [Line Items]    
Recorded Investment in Loans with No Specific Reserve 656 1,016
Recorded Investment in Loans with a Specific Reserve 0 270
Unpaid Principal Balance 754 2,141
Specific Reserve $ 0 $ 18