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Loans and Allowance for Credit Losses - Schedule of Types of Collateral (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	$ 32,577,834	$ 31,123,641
Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	207,556	168,623
Blanket Lien
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	33,031	43,245
Investment Securities/Cash
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	1,674	4,408
Auto
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	4,870	5,085
Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	6,562	7,414
Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	9,333,448	9,508,904
Commercial | Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	13,635	8,962
Commercial | Blanket Lien
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	31,856	42,754
Commercial | Investment Securities/Cash
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	466	2,690
Commercial | Auto
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	288	1,611
Commercial | Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	347	980
Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	13,916,221	12,457,070
Commercial real estate | Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	131,826	108,871
Commercial real estate | Blanket Lien
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	0	0
Commercial real estate | Investment Securities/Cash
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	1,205	1,718
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	6,184	6,411
BBCC | Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	2,131	1,939
BBCC | Blanket Lien
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	1,174	478
BBCC | Investment Securities/Cash
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	0	0
BBCC | Auto
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	416	12
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	6,696,288	6,460,441
Residential real estate | Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	40,342	34,660
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	1,047,224	1,034,257
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	3,870	3,230
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	542,689	629,186
Direct | Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	4,622	2,991
Direct | Blanket Lien
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	1	13
Direct | Investment Securities/Cash
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	3	0
Direct | Auto
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	296	232
Direct | Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	31	23
Home equity
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	1,041,964	1,033,783
Home equity | Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	15,000	11,200
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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph c
-Publisher SEC

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- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479344/326-20-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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-Name Accounting Standards Codification
-Section 50
-Paragraph 3B
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-3B

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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-Name Accounting Standards Codification
-Section 50
-Paragraph 5
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-5

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