Allowance for Credit Losses (Troubled Debt Restructuring) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructuring	$ 197,969	$ 208,180
Nonaccruing	187,464	191,483
Accruing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructuring	139,304	157,364
Nonaccruing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Nonaccruing	58,665	50,816
Non-PCD Loans | Commercial | Construction and land development
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructuring	446	632
Non-PCD Loans | Commercial | Owner occupied commercial mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructuring	49,313	48,463
Non-PCD Loans | Commercial | Non-owner occupied commercial mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructuring	23,838	19,985
Non-PCD Loans | Commercial | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructuring	21,330	32,659
Non-PCD Loans | Commercial | Total commercial loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructuring	94,927	101,739
Non-PCD Loans | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructuring	69,988	81,478
Non-PCD Loans | Consumer | Construction and land development
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructuring	2,771	1,582
Non-PCD Loans | Consumer | Consumer auto
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructuring	2,787	2,714
Non-PCD Loans | Consumer | Mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructuring	38,299	48,838
Non-PCD Loans | Consumer | Revolving mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructuring	25,234	27,252
Non-PCD Loans | Consumer | Consumer and Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructuring	897	1,092
Non-PCD Loans | Accruing | Commercial | Construction and land development
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructuring	408	578
Non-PCD Loans | Accruing | Commercial | Owner occupied commercial mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructuring	37,216	37,574
Non-PCD Loans | Accruing | Commercial | Non-owner occupied commercial mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructuring	20,364	18,336
Non-PCD Loans | Accruing | Commercial | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructuring	12,761	29,131
Non-PCD Loans | Accruing | Commercial | Total commercial loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructuring	70,749	85,619
Non-PCD Loans | Accruing | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructuring	44,574	54,128
Non-PCD Loans | Accruing | Consumer | Construction and land development
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructuring	2,482	1,573
Non-PCD Loans | Accruing | Consumer | Consumer auto
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructuring	2,134	2,018
Non-PCD Loans | Accruing | Consumer | Mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructuring	21,079	29,458
Non-PCD Loans | Accruing | Consumer | Revolving mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructuring	18,038	20,124
Non-PCD Loans | Accruing | Consumer | Consumer and Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructuring	841	955
Non-PCD Loans | Nonaccruing | Commercial | Construction and land development
Financing Receivable, Troubled Debt Restructuring [Line Items]
Nonaccruing	38	54
Non-PCD Loans | Nonaccruing | Commercial | Owner occupied commercial mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Nonaccruing	12,097	10,889
Non-PCD Loans | Nonaccruing | Commercial | Non-owner occupied commercial mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Nonaccruing	3,474	1,649
Non-PCD Loans | Nonaccruing | Commercial | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Nonaccruing	8,569	3,528
Non-PCD Loans | Nonaccruing | Commercial | Total commercial loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Nonaccruing	24,178	16,120
Non-PCD Loans | Nonaccruing | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Nonaccruing	25,414	27,350
Non-PCD Loans | Nonaccruing | Consumer | Construction and land development
Financing Receivable, Troubled Debt Restructuring [Line Items]
Nonaccruing	289	9
Non-PCD Loans | Nonaccruing | Consumer | Consumer auto
Financing Receivable, Troubled Debt Restructuring [Line Items]
Nonaccruing	653	696
Non-PCD Loans | Nonaccruing | Consumer | Mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Nonaccruing	17,220	19,380
Non-PCD Loans | Nonaccruing | Consumer | Revolving mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Nonaccruing	7,196	7,128
Non-PCD Loans | Nonaccruing | Consumer | Consumer and Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Nonaccruing	56	137
PCD Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructuring	33,054	24,963
PCD Loans | Accruing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructuring	23,981	17,617
PCD Loans | Nonaccruing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Nonaccruing	$ 9,073	$ 7,346