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Allowance for Credit Losses (Summary of Allowance for Credit Losses) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2020
Jan. 01, 2020
Receivables [Abstract]          
Financing receivable, allowance for credit loss, expected, COVID-19       $ 0  
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance $ 225,141,000 $ 223,712,000 $ 221,893,000    
Provisions 58,352,000   28,467,000    
Initial PCD allowance 1,193,000        
Charge-offs (45,105,000)   (39,671,000)    
Recoveries 22,657,000   13,023,000    
Ending balance 224,314,000 225,141,000 223,712,000    
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss 224,314,000 223,712,000 223,712,000 224,314,000  
Financing Receivable, Allowance For Credit Loss, Decrease, COVID-19 $ 36,100,000        
Allowance for credit loss, forecast period 2 years        
Financial Asset Acquired and No Credit Deterioration          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance $ 217,605,000        
Ending balance   217,605,000      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss 217,605,000 217,605,000      
PCD Loans          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 7,536,000 9,144,000 10,026,000    
Provisions (7,202,000) (1,608,000) (765,000)    
Initial PCD allowance 1,193,000        
Charge-offs (3,300,000) 0 (117,000)    
Recoveries 6,759,000 0 0    
Ending balance 23,987,000 7,536,000 9,144,000    
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss 7,536,000 7,536,000 9,144,000 23,987,000  
Cumulative Effect, Period of Adoption, Adjustment          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance (37,924,000)        
Ending balance   (37,924,000)      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss (37,924,000) (37,924,000)     $ (37,900,000)
Cumulative Effect, Period of Adoption, Adjustment | Financial Asset Acquired and No Credit Deterioration          
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss         (56,900,000)
Cumulative Effect, Period of Adoption, Adjustment | PCD Loans          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 19,001,000        
Ending balance   19,001,000      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss 19,001,000 19,001,000     $ 19,000,000.0
Cumulative Effect, Period of Adoption, Adjusted Balance          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 187,217,000        
Ending balance   187,217,000      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss 187,217,000 187,217,000      
Cumulative Effect, Period of Adoption, Adjusted Balance | PCD Loans          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 26,537,000        
Ending balance   26,537,000      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss 26,537,000 26,537,000      
Commercial | Construction and land development          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 33,213,000 35,270,000 24,470,000    
Provisions 4,301,000   10,533,000    
Initial PCD allowance 0        
Charge-offs (138,000)   (44,000)    
Recoveries 431,000   311,000    
Ending balance 6,746,000 33,213,000 35,270,000    
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss 6,746,000 35,270,000 35,270,000 6,746,000  
Commercial | Construction and land development | Financial Asset Acquired and No Credit Deterioration          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 33,213,000        
Ending balance   33,213,000      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss 33,213,000 33,213,000      
Commercial | Construction and land development | Cumulative Effect, Period of Adoption, Adjustment          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance (31,061,000)        
Ending balance   (31,061,000)      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss (31,061,000) (31,061,000)      
Commercial | Construction and land development | Cumulative Effect, Period of Adoption, Adjusted Balance          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 2,152,000        
Ending balance   2,152,000      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss 2,152,000 2,152,000      
Commercial | Mortgage          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance   43,451,000 45,005,000    
Provisions     (1,490,000)    
Charge-offs     (1,140,000)    
Recoveries     1,076,000    
Ending balance     43,451,000    
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss   43,451,000 43,451,000    
Commercial | Mortgage | Financial Asset Acquired and No Credit Deterioration          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 45,335,000        
Ending balance   45,335,000      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss 45,335,000 45,335,000      
Commercial | Other commercial real estate          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance   2,481,000 4,571,000    
Provisions     (2,171,000)    
Charge-offs     (69,000)    
Recoveries     150,000    
Ending balance     2,481,000    
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss   2,481,000 2,481,000    
Commercial | Other commercial real estate | Financial Asset Acquired and No Credit Deterioration          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 2,211,000        
Ending balance   2,211,000      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss 2,211,000 2,211,000      
Commercial | Commercial and industrial          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 61,610,000 55,620,000 59,824,000    
Provisions 13,816,000   2,511,000    
Initial PCD allowance 0        
Charge-offs (14,904,000)   (10,211,000)    
Recoveries 4,894,000   3,496,000    
Ending balance 27,779,000 61,610,000 55,620,000    
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss 27,779,000 55,620,000 55,620,000 27,779,000  
Commercial | Commercial and industrial | Financial Asset Acquired and No Credit Deterioration          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 59,374,000        
Ending balance   59,374,000      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss 59,374,000 59,374,000      
Commercial | Commercial and industrial | Cumulative Effect, Period of Adoption, Adjustment          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance (37,637,000)        
Ending balance   (37,637,000)      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss (37,637,000) (37,637,000)      
Commercial | Commercial and industrial | Cumulative Effect, Period of Adoption, Adjusted Balance          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 23,973,000        
Ending balance   23,973,000      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss 23,973,000 23,973,000      
Commercial | Other          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance   2,221,000 4,689,000    
Provisions     (2,827,000)    
Charge-offs     (130,000)    
Recoveries     489,000    
Ending balance     2,221,000    
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss   2,221,000 2,221,000    
Commercial | Other | Financial Asset Acquired and No Credit Deterioration          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 2,236,000        
Ending balance   2,236,000      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss 2,236,000 2,236,000      
Commercial | Mortgage Receivable, Owner Occupied          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 36,444,000        
Provisions 6,729,000        
Initial PCD allowance 0        
Charge-offs (593,000)        
Recoveries 401,000        
Ending balance 23,665,000 36,444,000      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss 23,665,000 36,444,000   23,665,000  
Commercial | Mortgage Receivable, Owner Occupied | Cumulative Effect, Period of Adoption, Adjustment          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance (19,316,000)        
Ending balance   (19,316,000)      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss (19,316,000) (19,316,000)      
Commercial | Mortgage Receivable, Owner Occupied | Cumulative Effect, Period of Adoption, Adjusted Balance          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 17,128,000        
Ending balance   17,128,000      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss 17,128,000 17,128,000      
Commercial | Mortgage Receivable, Non-Owner Occupied          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 11,102,000        
Provisions 12,917,000        
Initial PCD allowance 0        
Charge-offs (1,951,000)        
Recoveries 124,000        
Ending balance 22,652,000 11,102,000      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss 22,652,000 11,102,000   22,652,000  
Commercial | Mortgage Receivable, Non-Owner Occupied | Cumulative Effect, Period of Adoption, Adjustment          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 460,000        
Ending balance   460,000      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss 460,000 460,000      
Commercial | Mortgage Receivable, Non-Owner Occupied | Cumulative Effect, Period of Adoption, Adjusted Balance          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 11,562,000        
Ending balance   11,562,000      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss 11,562,000 11,562,000      
Consumer Portfolio Segment | Construction and land development          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 2,709,000 2,350,000 3,962,000    
Provisions 266,000   (1,520,000)    
Initial PCD allowance 0        
Charge-offs (70,000)   (219,000)    
Recoveries 117,000   127,000    
Ending balance 1,731,000 2,709,000 2,350,000    
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss 1,731,000 2,350,000 2,350,000 1,731,000  
Consumer Portfolio Segment | Construction and land development | Financial Asset Acquired and No Credit Deterioration          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 2,709,000        
Ending balance   2,709,000      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss 2,709,000 2,709,000      
Consumer Portfolio Segment | Construction and land development | Cumulative Effect, Period of Adoption, Adjustment          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance (1,291,000)        
Ending balance   (1,291,000)      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss (1,291,000) (1,291,000)      
Consumer Portfolio Segment | Construction and land development | Cumulative Effect, Period of Adoption, Adjusted Balance          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 1,418,000        
Ending balance   1,418,000      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss 1,418,000 1,418,000      
Consumer Portfolio Segment | Mortgage | Financial Asset Acquired and No Credit Deterioration          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 18,232,000        
Ending balance   18,232,000      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss 18,232,000 18,232,000      
Consumer Portfolio Segment | Consumer          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance   35,841,000 31,204,000    
Provisions     22,187,000    
Charge-offs     (22,817,000)    
Recoveries     5,267,000    
Ending balance     35,841,000    
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss   35,841,000 35,841,000    
Consumer Portfolio Segment | Consumer | Financial Asset Acquired and No Credit Deterioration          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 34,593,000        
Ending balance   34,593,000      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss 34,593,000 34,593,000      
Consumer Portfolio Segment | Residential Mortgage          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 18,232,000 15,472,000 15,706,000    
Provisions 9,684,000   897,000    
Initial PCD allowance 0        
Charge-offs (1,653,000)   (1,689,000)    
Recoveries 717,000   558,000    
Ending balance 44,098,000 18,232,000 15,472,000    
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss 44,098,000 15,472,000 15,472,000 44,098,000  
Consumer Portfolio Segment | Residential Mortgage | Cumulative Effect, Period of Adoption, Adjustment          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 17,118,000        
Ending balance   17,118,000      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss 17,118,000 17,118,000      
Consumer Portfolio Segment | Residential Mortgage | Cumulative Effect, Period of Adoption, Adjusted Balance          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 35,350,000        
Ending balance   35,350,000      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss 35,350,000 35,350,000      
Consumer Portfolio Segment | Revolving Mortgage          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 19,702,000 21,862,000 22,436,000    
Provisions 1,134,000   1,112,000    
Initial PCD allowance 0        
Charge-offs (1,662,000)   (3,235,000)    
Recoveries 1,918,000   1,549,000    
Ending balance 24,757,000 19,702,000 21,862,000    
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss 24,757,000 21,862,000 $ 21,862,000 24,757,000  
Consumer Portfolio Segment | Revolving Mortgage | Cumulative Effect, Period of Adoption, Adjustment          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 3,665,000        
Ending balance   3,665,000      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss 3,665,000 3,665,000      
Consumer Portfolio Segment | Revolving Mortgage | Cumulative Effect, Period of Adoption, Adjusted Balance          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 23,367,000        
Ending balance   23,367,000      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss 23,367,000 23,367,000      
Consumer Portfolio Segment | Consumer Auto Loan          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 4,292,000        
Provisions 6,297,000        
Initial PCD allowance 0        
Charge-offs (3,646,000)        
Recoveries 1,417,000        
Ending balance 9,460,000 4,292,000      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss 9,460,000 4,292,000   9,460,000  
Consumer Portfolio Segment | Consumer Auto Loan | Cumulative Effect, Period of Adoption, Adjustment          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 1,100,000        
Ending balance   1,100,000      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss 1,100,000 1,100,000      
Consumer Portfolio Segment | Consumer Auto Loan | Cumulative Effect, Period of Adoption, Adjusted Balance          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 5,392,000        
Ending balance   5,392,000      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss 5,392,000 5,392,000      
Consumer Portfolio Segment | Consumer Loan, Other          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 30,301,000        
Provisions 10,410,000        
Initial PCD allowance 0        
Charge-offs (17,188,000)        
Recoveries 5,879,000        
Ending balance 39,439,000 30,301,000      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss 39,439,000 30,301,000   39,439,000  
Consumer Portfolio Segment | Consumer Loan, Other | Cumulative Effect, Period of Adoption, Adjustment          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 10,037,000        
Ending balance   10,037,000      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss 10,037,000 10,037,000      
Consumer Portfolio Segment | Consumer Loan, Other | Cumulative Effect, Period of Adoption, Adjusted Balance          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 40,338,000        
Ending balance   40,338,000      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss 40,338,000 40,338,000      
Unfunded Loan Commitment          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 1,055,000        
Provisions 2,874,000        
Ending balance 12,814,000 1,055,000      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss 12,814,000 1,055,000   $ 12,814,000  
Unfunded Loan Commitment | Cumulative Effect, Period of Adoption, Adjustment          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 8,885,000        
Ending balance   8,885,000      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss 8,885,000 8,885,000      
Unfunded Loan Commitment | Cumulative Effect, Period of Adoption, Adjusted Balance          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 9,940,000        
Ending balance   9,940,000      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss 9,940,000 9,940,000      
Non-PCI Loans          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 225,141,000        
Provisions   31,441,000      
Charge-offs   (43,027,000)      
Recoveries   13,015,000      
Ending balance   225,141,000      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss 225,141,000 225,141,000      
Non-PCI Loans | Commercial | Construction and land development          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 33,213,000        
Provisions   (2,171,000)      
Charge-offs   (196,000)      
Recoveries   310,000      
Ending balance   33,213,000      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss 33,213,000 33,213,000      
Non-PCI Loans | Commercial | Mortgage          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 45,335,000        
Provisions   2,384,000      
Charge-offs   (1,096,000)      
Recoveries   596,000      
Ending balance   45,335,000      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss 45,335,000 45,335,000      
Non-PCI Loans | Commercial | Other commercial real estate          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 2,211,000        
Provisions   (285,000)      
Charge-offs   0      
Recoveries   15,000      
Ending balance   2,211,000      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss 2,211,000 2,211,000      
Non-PCI Loans | Commercial | Commercial and industrial          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 59,374,000        
Provisions   14,212,000      
Charge-offs   (13,352,000)      
Recoveries   2,894,000      
Ending balance   59,374,000      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss 59,374,000 59,374,000      
Non-PCI Loans | Commercial | Other          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 2,236,000        
Provisions   (754,000)      
Charge-offs   (100,000)      
Recoveries   869,000      
Ending balance   2,236,000      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss 2,236,000 2,236,000      
Non-PCI Loans | Consumer Portfolio Segment | Construction and land development          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 2,709,000        
Provisions   359,000      
Charge-offs   0      
Recoveries   0      
Ending balance   2,709,000      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss 2,709,000 2,709,000      
Non-PCI Loans | Consumer Portfolio Segment | Consumer          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 34,593,000        
Provisions   16,611,000      
Charge-offs   (24,562,000)      
Recoveries   6,703,000      
Ending balance   34,593,000      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss 34,593,000 34,593,000      
Non-PCI Loans | Consumer Portfolio Segment | Residential Mortgage          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 18,232,000        
Provisions   3,481,000      
Charge-offs   (1,137,000)      
Recoveries   416,000      
Ending balance   18,232,000      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss 18,232,000 18,232,000      
Non-PCI Loans | Consumer Portfolio Segment | Revolving Mortgage          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 19,702,000        
Provisions   (788,000)      
Charge-offs   (2,584,000)      
Recoveries   1,212,000      
Ending balance   19,702,000      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss 19,702,000 19,702,000      
PCD Loans          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 7,536,000        
Ending balance   7,536,000      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Increase (decrease) in allowance for credit loss $ 7,536,000 $ 7,536,000