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Loans and Allowance for Credit Losses - Narrative (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024 USD ($) loan category	Mar. 31, 2023 USD ($) loan	Dec. 31, 2023 USD ($)
Financing Receivable, Impaired [Line Items]
Foreclosed properties held	$ 800
Number of points in internal risk rating system | category	9
Number of categories in internal risk rating system considered as not criticized | category	6
Commercial relationship credit review threshold amount	$ 1,000
Liability for unfunded commitments	1,000		$ 1,000
Charge-offs	$ 2,150	$ 4,847	18,479
Number of loans modified in period | loan	6	0
Number of borrowers with modified loans | loan	6
Total	$ 1,377
Minimum
Financing Receivable, Impaired [Line Items]
Percentage of commercial outstanding loan balances	40.00%
Maximum
Financing Receivable, Impaired [Line Items]
Percentage of commercial outstanding loan balances	45.00%
Residential real estate
Financing Receivable, Impaired [Line Items]
Number foreclosed properties held | loan	1,000,000
Investment in loans in the process of foreclosure	$ 200
Charge-offs	0	$ 22	400
Total	$ 0
Total commercial
Financing Receivable, Impaired [Line Items]
Number foreclosed properties held | loan	2
Charge-offs	$ 981	141
Total	1,377
Total commercial | Subprime Consumer Automotive Segment
Financing Receivable, Impaired [Line Items]
Charge-offs	$ 600
Charge-off percentage	27.00%
Total commercial | Funded Loan
Financing Receivable, Impaired [Line Items]
Charge-offs	$ 400
Charge-off percentage	18.00%
Total commercial | Business
Financing Receivable, Impaired [Line Items]
Charge-offs	$ 981	141	4,572
Total	$ 1,377
Total commercial | Business | Government-Guaranteed Collateral
Financing Receivable, Impaired [Line Items]
Number of loans modified in period | loan	6
Total	$ 1,400
Consumer
Financing Receivable, Impaired [Line Items]
Charge-offs	1,169	$ 4,684	$ 13,507
Total	0
Consumer | Subprime Consumer Automotive Segment
Financing Receivable, Impaired [Line Items]
Charge-offs	$ 1,200
Charge-off percentage	55.00%

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
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