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Loans and Allowance for Credit Losses - Schedule of Types of Collateral (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	$ 13,925,261	$ 13,786,479
Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	96,482	101,194
Blanket Lien
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	22,168	21,654
Investment Securities/Cash
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	6,498	6,581
Auto
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	3,300	3,292
Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	13,658	14,607
Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	4,068,896	3,956,422
Commercial | Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	7,470	8,976
Commercial | Blanket Lien
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	20,081	19,253
Commercial | Investment Securities/Cash
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	5,352	5,379
Commercial | Auto
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	165	394
Commercial | Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	446	893
Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	6,074,135	5,946,512
Commercial real estate | Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	60,773	60,844
Commercial real estate | Blanket Lien
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	381	472
Commercial real estate | Investment Securities/Cash
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	1,088	1,137
Commercial real estate | Auto
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	0	0
Commercial real estate | Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	13,189	13,685
BBCC | Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	1,267	1,425
BBCC | Blanket Lien
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	1,706	1,929
BBCC | Investment Securities/Cash
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	56	63
BBCC | Auto
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	122	134
BBCC | Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	0	0
Residential real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	2,203,277	2,248,422
Residential real estate | Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	20,935	24,794
Residential real estate | Blanket Lien
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	0	0
Residential real estate | Investment Securities/Cash
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	0	0
Residential real estate | Auto
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	0	0
Residential real estate | Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	0	0
Indirect
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	887,333	913,902
Indirect | Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	0	0
Indirect | Blanket Lien
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	0	0
Indirect | Investment Securities/Cash
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	0	0
Indirect | Auto
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	2,786	2,529
Indirect | Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	0	0
Direct
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	150,471	164,807
Direct | Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	980	901
Direct | Blanket Lien
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	0	0
Direct | Investment Securities/Cash
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	2	2
Direct | Auto
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	227	235
Direct | Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	23	29
Home equity
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	541,149	556,414
Home equity | Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	5,057	4,254
Home equity | Blanket Lien
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	0	0
Home equity | Investment Securities/Cash
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	0	0
Home equity | Auto
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	0	0
Home equity | Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	$ 0	$ 0

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