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Loans and Allowance for Credit Losses on Loans - Summary of Loans By Classification (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Loans and Allowance for Credit Losses on Loans
Loans	$ 10,199,553	$ 7,470,872
ACL-Loans	71,752	44,014	$ 31,344	$ 27,500
Loans receivable	10,127,801	7,426,858
Accrued interest on loans, excluded from amortized cost of loans	60,400	35,000
Mortgage warehouse lines of credit
Loans and Allowance for Credit Losses on Loans
Loans	752,468	464,785
ACL-Loans	2,070	1,249	1,955	4,018
Residential real estate
Loans and Allowance for Credit Losses on Loans
Loans	1,324,305	1,178,401
ACL-Loans	7,323	7,029	4,170	3,334
Residential real estate | Home equity line of credit
Loans and Allowance for Credit Losses on Loans
Loans	1,200,000	1,100,000
Healthcare financing
Loans and Allowance for Credit Losses on Loans
Loans	2,356,689	1,604,341
ACL-Loans	22,454	9,882	4,461	2,591
Multi-family financing
Loans and Allowance for Credit Losses on Loans
Loans	4,006,160	3,135,535
ACL-Loans	26,874	16,781	14,084	12,140
Commercial and commercial real estate
Loans and Allowance for Credit Losses on Loans
Loans	1,643,081	978,661
ACL-Loans	12,243	8,326	5,879	4,641
Revolving lines of credit collateralized primarily by mortgage servicing rights	1,100,000	497,000
Commercial and commercial real estate | Non-owner occupied commercial real estate
Loans and Allowance for Credit Losses on Loans
Loans	$ 8,400	12,800
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	$ 103,150	95,651
ACL-Loans	619	565	657	636
Consumer and margin loans
Loans and Allowance for Credit Losses on Loans
Loans	13,700	13,498
ACL-Loans	$ 169	$ 182	$ 138	$ 140

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The amount of accrued interest on loans receivable.

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Percentage of loans receivable yet to be forgiven.

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The amount of revolving lines of credit collateralized primarily by mortgage servicing rights.

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

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
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-Publisher FASB
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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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