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Loans and Allowances for Credit Losses, Impaired Loans (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Impaired loans [Abstract]  
Impaired loans, unpaid principal balance $ 467,714
Impaired loans, recorded investment, total 372,645
Impaired loans, recorded investment with no related allowance 323,505
Impaired loans, recorded investment with related allowance 49,140
Impaired loans, related allowance 17,414
Impaired loans, average recorded investment 354,262
Impaired loans, interest income recognized 8,931
Commercial [Member]  
Impaired loans [Abstract]  
Impaired loans, unpaid principal balance 195,193
Impaired loans, recorded investment, total 115,416
Impaired loans, recorded investment with no related allowance 66,276
Impaired loans, recorded investment with related allowance 49,140
Impaired loans, related allowance 17,414
Impaired loans, average recorded investment 101,399
Impaired loans, interest income recognized 0
Commercial [Member] | Energy [Member]  
Impaired loans [Abstract]  
Impaired loans, unpaid principal balance 149,441
Impaired loans, recorded investment, total 91,722
Impaired loans, recorded investment with no related allowance 44,244
Impaired loans, recorded investment with related allowance 47,478
Impaired loans, related allowance 16,854
Impaired loans, average recorded investment 69,119
Impaired loans, interest income recognized 0
Commercial [Member] | Services [Member]  
Impaired loans [Abstract]  
Impaired loans, unpaid principal balance 10,923
Impaired loans, recorded investment, total 7,483
Impaired loans, recorded investment with no related allowance 6,301
Impaired loans, recorded investment with related allowance 1,182
Impaired loans, related allowance 240
Impaired loans, average recorded investment 5,854
Impaired loans, interest income recognized 0
Commercial [Member] | Wholesale/retail [Member]  
Impaired loans [Abstract]  
Impaired loans, unpaid principal balance 1,980
Impaired loans, recorded investment, total 1,163
Impaired loans, recorded investment with no related allowance 902
Impaired loans, recorded investment with related allowance 261
Impaired loans, related allowance 101
Impaired loans, average recorded investment 916
Impaired loans, interest income recognized 0
Commercial [Member] | Manufacturing [Member]  
Impaired loans [Abstract]  
Impaired loans, unpaid principal balance 10,848
Impaired loans, recorded investment, total 10,133
Impaired loans, recorded investment with no related allowance 9,914
Impaired loans, recorded investment with related allowance 219
Impaired loans, related allowance 219
Impaired loans, average recorded investment 9,144
Impaired loans, interest income recognized 0
Commercial [Member] | Healthcare [Member]  
Impaired loans [Abstract]  
Impaired loans, unpaid principal balance 13,774
Impaired loans, recorded investment, total 4,480
Impaired loans, recorded investment with no related allowance 4,480
Impaired loans, recorded investment with related allowance 0
Impaired loans, related allowance 0
Impaired loans, average recorded investment 7,798
Impaired loans, interest income recognized 0
Commercial [Member] | Public finance [Member]  
Impaired loans [Abstract]  
Impaired loans, unpaid principal balance 0
Impaired loans, recorded investment, total 0
Impaired loans, recorded investment with no related allowance 0
Impaired loans, recorded investment with related allowance 0
Impaired loans, related allowance 0
Impaired loans, average recorded investment 0
Impaired loans, interest income recognized 0
Commercial [Member] | Other commercial and industrial [Member]  
Impaired loans [Abstract]  
Impaired loans, unpaid principal balance 8,227
Impaired loans, recorded investment, total 435
Impaired loans, recorded investment with no related allowance 435
Impaired loans, recorded investment with related allowance 0
Impaired loans, related allowance 0
Impaired loans, average recorded investment 8,568
Impaired loans, interest income recognized 0
Commercial real estate [Member]  
Impaired loans [Abstract]  
Impaired loans, unpaid principal balance 30,139
Impaired loans, recorded investment, total 27,626
Impaired loans, recorded investment with no related allowance 27,626
Impaired loans, recorded investment with related allowance 0
Impaired loans, related allowance 0
Impaired loans, average recorded investment 24,623
Impaired loans, interest income recognized 0
Commercial real estate [Member] | Residential construction and land development [Member]  
Impaired loans [Abstract]  
Impaired loans, unpaid principal balance 1,306
Impaired loans, recorded investment, total 350
Impaired loans, recorded investment with no related allowance 350
Impaired loans, recorded investment with related allowance 0
Impaired loans, related allowance 0
Impaired loans, average recorded investment 350
Impaired loans, interest income recognized 0
Commercial real estate [Member] | Retail [Member]  
Impaired loans [Abstract]  
Impaired loans, unpaid principal balance 20,265
Impaired loans, recorded investment, total 18,868
Impaired loans, recorded investment with no related allowance 18,868
Impaired loans, recorded investment with related allowance 0
Impaired loans, related allowance 0
Impaired loans, average recorded investment 19,573
Impaired loans, interest income recognized 0
Commercial real estate [Member] | Office [Member]  
Impaired loans [Abstract]  
Impaired loans, unpaid principal balance 0
Impaired loans, recorded investment, total 0
Impaired loans, recorded investment with no related allowance 0
Impaired loans, recorded investment with related allowance 0
Impaired loans, related allowance 0
Impaired loans, average recorded investment 0
Impaired loans, interest income recognized 0
Commercial real estate [Member] | Multifamily [Member]  
Impaired loans [Abstract]  
Impaired loans, unpaid principal balance 6,858
Impaired loans, recorded investment, total 6,858
Impaired loans, recorded investment with no related allowance 6,858
Impaired loans, recorded investment with related allowance 0
Impaired loans, related allowance 0
Impaired loans, average recorded investment 3,580
Impaired loans, interest income recognized 0
Commercial real estate [Member] | Industrial [Member]  
Impaired loans [Abstract]  
Impaired loans, unpaid principal balance 909
Impaired loans, recorded investment, total 909
Impaired loans, recorded investment with no related allowance 909
Impaired loans, recorded investment with related allowance 0
Impaired loans, related allowance 0
Impaired loans, average recorded investment 454
Impaired loans, interest income recognized 0
Commercial real estate [Member] | Other commercial real estate [Member]  
Impaired loans [Abstract]  
Impaired loans, unpaid principal balance 801
Impaired loans, recorded investment, total 641
Impaired loans, recorded investment with no related allowance 641
Impaired loans, recorded investment with related allowance 0
Impaired loans, related allowance 0
Impaired loans, average recorded investment 666
Impaired loans, interest income recognized 0
Loans to individuals [Member] | Permanent residential mortgage [Member]  
Impaired loans [Abstract]  
Impaired loans, unpaid principal balance 24,868
Impaired loans, recorded investment, total 20,441
Impaired loans, recorded investment with no related allowance 20,441
Impaired loans, recorded investment with related allowance 0
Impaired loans, related allowance 0
Impaired loans, average recorded investment 22,196
Impaired loans, interest income recognized 1,198
Loans to individuals [Member] | Permanent residential mortgage [Member] | US Government Agency Insured Loans  
Impaired loans [Abstract]  
Impaired loans, unpaid principal balance 204,187 [1]
Impaired loans, recorded investment, total 197,794 [1]
Impaired loans, recorded investment with no related allowance 197,794 [1]
Impaired loans, recorded investment with related allowance 0 [1]
Impaired loans, related allowance 0 [1]
Impaired loans, average recorded investment 195,009 [1]
Impaired loans, interest income recognized 7,733 [1]
Loans to individuals [Member] | Home Equity Loan  
Impaired loans [Abstract]  
Impaired loans, unpaid principal balance 12,967
Impaired loans, recorded investment, total 11,081
Impaired loans, recorded investment with no related allowance 11,081
Impaired loans, recorded investment with related allowance 0
Impaired loans, related allowance 0
Impaired loans, average recorded investment 10,776
Impaired loans, interest income recognized 0
Loans to individuals [Member] | Residential Mortgage [Member]  
Impaired loans [Abstract]  
Impaired loans, unpaid principal balance 242,022
Impaired loans, recorded investment, total 229,316
Impaired loans, recorded investment with no related allowance 229,316
Impaired loans, recorded investment with related allowance 0
Impaired loans, related allowance 0
Impaired loans, average recorded investment 227,981
Impaired loans, interest income recognized 8,931
Loans to individuals [Member] | Personal [Member]  
Impaired loans [Abstract]  
Impaired loans, unpaid principal balance 360
Impaired loans, recorded investment, total 287
Impaired loans, recorded investment with no related allowance 287
Impaired loans, recorded investment with related allowance 0
Impaired loans, related allowance 0
Impaired loans, average recorded investment 259
Impaired loans, interest income recognized $ 0
[1] All permanent mortgage loans guaranteed by U.S. government agencies are considered impaired as we do not expect full collection of contractual principal and interest. At December 31, 2019, the majority were accruing based on the guarantee by U.S. government agencies.