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Loans and Allowance for Credit Losses on Loans - Summary of Loans By Classification (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Loans and Allowance for Credit Losses on Loans
Loans	$ 10,766,225	$ 10,199,553
ACL-Loans	75,712	71,752	$ 51,838	$ 44,014
Loans receivable	10,690,513	10,127,801
Accrued interest on loans, excluded from amortized cost of loans	60,200	60,400
Mortgage warehouse lines of credit
Loans and Allowance for Credit Losses on Loans
Loans	1,142,994	752,468
ACL-Loans	3,022	2,070	1,664	1,249
Residential real estate
Loans and Allowance for Credit Losses on Loans
Loans	1,321,300	1,324,305
ACL-Loans	6,905	7,323	7,378	7,029
Residential real estate | Home equity line of credit
Loans and Allowance for Credit Losses on Loans
Loans	1,200,000	1,200,000
Healthcare financing
Loans and Allowance for Credit Losses on Loans
Loans	2,464,685	2,356,689
ACL-Loans	24,587	22,454	11,753	9,882
Multi-family financing
Loans and Allowance for Credit Losses on Loans
Loans	4,096,606	4,006,160
ACL-Loans	28,664	26,874	19,851	16,781
Commercial and commercial real estate
Loans and Allowance for Credit Losses on Loans
Loans	1,666,751	1,643,081
ACL-Loans	11,990	12,243	10,482	8,326
Revolving lines of credit collateralized primarily by mortgage servicing rights	1,100,000	1,100,000
Commercial and commercial real estate | Non-owner occupied commercial real estate
Loans and Allowance for Credit Losses on Loans
Loans	$ 6,800	8,400
Commercial and commercial real estate | Non-owner occupied commercial real estate | Minimum
Loans and Allowance for Credit Losses on Loans
Percentage of loans to be forgiven	1
Agricultural production and real estate
Loans and Allowance for Credit Losses on Loans
Loans	$ 65,977	103,150
ACL-Loans	450	619	543	565
Consumer and margin loans
Loans and Allowance for Credit Losses on Loans
Loans	7,912	13,700
ACL-Loans	$ 94	$ 169	$ 167	$ 182

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The amount of accrued interest on loans receivable.

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Amount excluding accrued interest, of allowance for credit loss on 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

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

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