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Allowance for Credit Losses (Troubled Debt Restructuring) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable, Modifications [Line Items]        
Accruing $ 208,180   $ 171,192 $ 156,130
Nonaccruing 191,483 $ 168,717    
Financial Asset Acquired and No Credit Deterioration        
Financing Receivable, Modifications [Line Items]        
Accruing     154,000 137,900
PCD Loans        
Financing Receivable, Modifications [Line Items]        
Accruing 24,963   17,200 18,200
Commercial        
Financing Receivable, Modifications [Line Items]        
Accruing     77,536 74,560
Commercial | Construction and land development        
Financing Receivable, Modifications [Line Items]        
Accruing     2,766 2,298
Commercial | Construction and land development | Financial Asset Acquired and No Credit Deterioration        
Financing Receivable, Modifications [Line Items]        
Accruing 632      
Commercial | Mortgage        
Financing Receivable, Modifications [Line Items]        
Accruing     61,935 61,065
Commercial | Other commercial real estate        
Financing Receivable, Modifications [Line Items]        
Accruing     571 860
Commercial | Commercial and industrial        
Financing Receivable, Modifications [Line Items]        
Accruing     11,839 10,046
Commercial | Commercial and industrial | Financial Asset Acquired and No Credit Deterioration        
Financing Receivable, Modifications [Line Items]        
Accruing 32,659      
Commercial | Other        
Financing Receivable, Modifications [Line Items]        
Accruing     425 291
Commercial | Other | Financial Asset Acquired and No Credit Deterioration        
Financing Receivable, Modifications [Line Items]        
Accruing 101,739      
Commercial | Mortgage Receivable, Owner Occupied | Financial Asset Acquired and No Credit Deterioration        
Financing Receivable, Modifications [Line Items]        
Accruing 48,463      
Commercial | Mortgage Receivable, Non-Owner Occupied | Financial Asset Acquired and No Credit Deterioration        
Financing Receivable, Modifications [Line Items]        
Accruing 19,985      
Consumer Portfolio Segment        
Financing Receivable, Modifications [Line Items]        
Accruing     93,656 81,570
Consumer Portfolio Segment | Financial Asset Acquired and No Credit Deterioration        
Financing Receivable, Modifications [Line Items]        
Accruing 81,478      
Consumer Portfolio Segment | Construction and land development        
Financing Receivable, Modifications [Line Items]        
Accruing     3,882 2,337
Consumer Portfolio Segment | Construction and land development | Financial Asset Acquired and No Credit Deterioration        
Financing Receivable, Modifications [Line Items]        
Accruing 1,582      
Consumer Portfolio Segment | Consumer Auto Loan | Financial Asset Acquired and No Credit Deterioration        
Financing Receivable, Modifications [Line Items]        
Accruing 2,714      
Consumer Portfolio Segment | Mortgage        
Financing Receivable, Modifications [Line Items]        
Accruing     57,861 47,524
Consumer Portfolio Segment | Mortgage | Financial Asset Acquired and No Credit Deterioration        
Financing Receivable, Modifications [Line Items]        
Accruing 48,838      
Consumer Portfolio Segment | Revolving mortgage        
Financing Receivable, Modifications [Line Items]        
Accruing     28,399 28,688
Consumer Portfolio Segment | Revolving mortgage | Financial Asset Acquired and No Credit Deterioration        
Financing Receivable, Modifications [Line Items]        
Accruing 27,252      
Consumer Portfolio Segment | Consumer and Other        
Financing Receivable, Modifications [Line Items]        
Accruing     3,514 3,021
Consumer Portfolio Segment | Consumer and Other | Financial Asset Acquired and No Credit Deterioration        
Financing Receivable, Modifications [Line Items]        
Accruing 1,092      
Accruing        
Financing Receivable, Modifications [Line Items]        
Accruing 157,364   128,750 127,093
Accruing | PCD Loans        
Financing Receivable, Modifications [Line Items]        
Accruing 17,617      
Accruing | Commercial        
Financing Receivable, Modifications [Line Items]        
Accruing     61,627 64,171
Accruing | Commercial | Construction and land development        
Financing Receivable, Modifications [Line Items]        
Accruing     487 1,946
Accruing | Commercial | Construction and land development | Financial Asset Acquired and No Credit Deterioration        
Financing Receivable, Modifications [Line Items]        
Accruing 578      
Accruing | Commercial | Mortgage        
Financing Receivable, Modifications [Line Items]        
Accruing     50,819 53,270
Accruing | Commercial | Other commercial real estate        
Financing Receivable, Modifications [Line Items]        
Accruing     571 851
Accruing | Commercial | Commercial and industrial        
Financing Receivable, Modifications [Line Items]        
Accruing     9,430 7,986
Accruing | Commercial | Commercial and industrial | Financial Asset Acquired and No Credit Deterioration        
Financing Receivable, Modifications [Line Items]        
Accruing 29,131      
Accruing | Commercial | Other        
Financing Receivable, Modifications [Line Items]        
Accruing     320 118
Accruing | Commercial | Other | Financial Asset Acquired and No Credit Deterioration        
Financing Receivable, Modifications [Line Items]        
Accruing 85,619      
Accruing | Commercial | Mortgage Receivable, Owner Occupied | Financial Asset Acquired and No Credit Deterioration        
Financing Receivable, Modifications [Line Items]        
Accruing 37,574      
Accruing | Commercial | Mortgage Receivable, Non-Owner Occupied | Financial Asset Acquired and No Credit Deterioration        
Financing Receivable, Modifications [Line Items]        
Accruing 18,336      
Accruing | Consumer Portfolio Segment        
Financing Receivable, Modifications [Line Items]        
Accruing     67,123 62,922
Accruing | Consumer Portfolio Segment | Financial Asset Acquired and No Credit Deterioration        
Financing Receivable, Modifications [Line Items]        
Accruing 54,128      
Accruing | Consumer Portfolio Segment | Construction and land development        
Financing Receivable, Modifications [Line Items]        
Accruing     1,452 2,227
Accruing | Consumer Portfolio Segment | Construction and land development | Financial Asset Acquired and No Credit Deterioration        
Financing Receivable, Modifications [Line Items]        
Accruing 1,573      
Accruing | Consumer Portfolio Segment | Consumer Auto Loan | Financial Asset Acquired and No Credit Deterioration        
Financing Receivable, Modifications [Line Items]        
Accruing 2,018      
Accruing | Consumer Portfolio Segment | Mortgage        
Financing Receivable, Modifications [Line Items]        
Accruing     41,813 37,903
Accruing | Consumer Portfolio Segment | Mortgage | Financial Asset Acquired and No Credit Deterioration        
Financing Receivable, Modifications [Line Items]        
Accruing 29,458      
Accruing | Consumer Portfolio Segment | Revolving mortgage        
Financing Receivable, Modifications [Line Items]        
Accruing     21,032 20,492
Accruing | Consumer Portfolio Segment | Revolving mortgage | Financial Asset Acquired and No Credit Deterioration        
Financing Receivable, Modifications [Line Items]        
Accruing 20,124      
Accruing | Consumer Portfolio Segment | Consumer and Other        
Financing Receivable, Modifications [Line Items]        
Accruing     2,826 2,300
Accruing | Consumer Portfolio Segment | Consumer and Other | Financial Asset Acquired and No Credit Deterioration        
Financing Receivable, Modifications [Line Items]        
Accruing 955      
Nonaccruing        
Financing Receivable, Modifications [Line Items]        
Accruing 50,816      
Nonaccruing     42,442 29,037
Nonaccruing | PCD Loans        
Financing Receivable, Modifications [Line Items]        
Accruing 7,346      
Nonaccruing | Commercial        
Financing Receivable, Modifications [Line Items]        
Nonaccruing     15,909 10,389
Nonaccruing | Commercial | Construction and land development        
Financing Receivable, Modifications [Line Items]        
Nonaccruing     2,279 352
Nonaccruing | Commercial | Construction and land development | Financial Asset Acquired and No Credit Deterioration        
Financing Receivable, Modifications [Line Items]        
Nonaccruing 54      
Nonaccruing | Commercial | Mortgage        
Financing Receivable, Modifications [Line Items]        
Nonaccruing     11,116 7,795
Nonaccruing | Commercial | Other commercial real estate        
Financing Receivable, Modifications [Line Items]        
Nonaccruing     0 9
Nonaccruing | Commercial | Commercial and industrial        
Financing Receivable, Modifications [Line Items]        
Nonaccruing     2,409 2,060
Nonaccruing | Commercial | Commercial and industrial | Financial Asset Acquired and No Credit Deterioration        
Financing Receivable, Modifications [Line Items]        
Nonaccruing 3,528      
Nonaccruing | Commercial | Other        
Financing Receivable, Modifications [Line Items]        
Nonaccruing     105 173
Nonaccruing | Commercial | Other | Financial Asset Acquired and No Credit Deterioration        
Financing Receivable, Modifications [Line Items]        
Nonaccruing 16,120      
Nonaccruing | Commercial | Mortgage Receivable, Owner Occupied | Financial Asset Acquired and No Credit Deterioration        
Financing Receivable, Modifications [Line Items]        
Nonaccruing 10,889      
Nonaccruing | Commercial | Mortgage Receivable, Non-Owner Occupied | Financial Asset Acquired and No Credit Deterioration        
Financing Receivable, Modifications [Line Items]        
Nonaccruing 1,649      
Nonaccruing | Consumer Portfolio Segment        
Financing Receivable, Modifications [Line Items]        
Nonaccruing     26,533 18,648
Nonaccruing | Consumer Portfolio Segment | Financial Asset Acquired and No Credit Deterioration        
Financing Receivable, Modifications [Line Items]        
Accruing 27,350      
Nonaccruing | Consumer Portfolio Segment | Construction and land development        
Financing Receivable, Modifications [Line Items]        
Nonaccruing     2,430 110
Nonaccruing | Consumer Portfolio Segment | Construction and land development | Financial Asset Acquired and No Credit Deterioration        
Financing Receivable, Modifications [Line Items]        
Nonaccruing 9      
Nonaccruing | Consumer Portfolio Segment | Consumer Auto Loan | Financial Asset Acquired and No Credit Deterioration        
Financing Receivable, Modifications [Line Items]        
Nonaccruing 696      
Nonaccruing | Consumer Portfolio Segment | Mortgage        
Financing Receivable, Modifications [Line Items]        
Nonaccruing     16,048 9,621
Nonaccruing | Consumer Portfolio Segment | Mortgage | Financial Asset Acquired and No Credit Deterioration        
Financing Receivable, Modifications [Line Items]        
Nonaccruing 19,380      
Nonaccruing | Consumer Portfolio Segment | Revolving mortgage        
Financing Receivable, Modifications [Line Items]        
Nonaccruing     7,367 8,196
Nonaccruing | Consumer Portfolio Segment | Revolving mortgage | Financial Asset Acquired and No Credit Deterioration        
Financing Receivable, Modifications [Line Items]        
Nonaccruing 7,128      
Nonaccruing | Consumer Portfolio Segment | Consumer and Other        
Financing Receivable, Modifications [Line Items]        
Nonaccruing     $ 688 $ 721
Nonaccruing | Consumer Portfolio Segment | Consumer and Other | Financial Asset Acquired and No Credit Deterioration        
Financing Receivable, Modifications [Line Items]        
Nonaccruing $ 137