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Loans and Allowance for Credit Losses - Schedule of Types of Collateral (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	$ 13,584,828	$ 13,786,479
Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	73,395	101,194
Blanket Lien
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	18,242	21,654
Investment Securities/Cash
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	4,037	6,581
Auto
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	2,802	3,292
Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	13,108	14,607
Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	3,505,183	3,956,422
Commercial | Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	6,762	8,976
Commercial | Blanket Lien
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	16,299	19,253
Commercial | Investment Securities/Cash
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	2,984	5,379
Commercial | Auto
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	95	394
Commercial | Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	394	893
Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	6,290,632	5,946,512
Commercial real estate | Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	41,170	60,844
Commercial real estate | Blanket Lien
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	364	472
Commercial real estate | Investment Securities/Cash
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	1,003	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	12,673	13,685
BBCC | Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	1,884	1,425
BBCC | Blanket Lien
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	1,579	1,929
BBCC | Investment Securities/Cash
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	45	63
BBCC | Auto
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	113	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	2,224,782	2,248,422
Residential real estate | Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	18,943	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	860,785	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	2,445	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	149,124	164,807
Direct | Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	998	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	5	2
Direct | Auto
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	149	235
Direct | Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	41	29
Home equity
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	554,322	556,414
Home equity | Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	3,638	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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
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