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Disclosures about Fair Value of Assets and Liabilities - Carrying Value and Estimated Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Financial assets:
Securities held to maturity	$ 1,176,178	$ 1,203,535
Loans held for sale	84,513	86,663
Carrying value per balance sheet
Financial assets:
Cash and cash equivalents	508,755	584,422
Securities purchased under agreements to resell	3,329	3,349
Securities held to maturity	1,175,167	1,204,217
FHLB stock	64,215	48,578
Loans held for sale	3,418,618	3,058,093
Loans receivable, net	10,690,513	10,127,801
Interest receivable	90,303	91,346
Financial liabilities:
Deposits	13,975,661	14,061,460
Short-term subordinated debt	64,922	64,922
FHLB advances	1,426,299	771,392
Other borrowing	232,934	7,934
Credit linked notes	111,830	119,879
Interest payable	51,790	43,423
Estimated fair value
Financial assets:
Cash and cash equivalents	508,755	584,422
Securities purchased under agreements to resell	3,329	3,349
Securities held to maturity	1,176,178	1,203,535
FHLB stock	64,215	48,578
Loans held for sale	3,418,618	3,058,093
Loans receivable, net	10,646,477	10,088,468
Interest receivable	90,303	91,346
Financial liabilities:
Deposits	13,973,624	14,062,457
Short-term subordinated debt	64,922	64,922
FHLB advances	1,425,888	771,029
Other borrowing	232,934	7,934
Credit linked notes	111,828	119,878
Interest payable	51,790	43,423
Level 1 | Estimated fair value
Financial assets:
Cash and cash equivalents	508,755	584,422
Financial liabilities:
Deposits	8,018,126	8,894,058
Level 2 | Estimated fair value
Financial assets:
Securities purchased under agreements to resell	3,329	3,349
Securities held to maturity	466,573	484,288
FHLB stock	64,215	48,578
Loans held for sale	3,418,618	3,058,093
Interest receivable	90,303	91,346
Financial liabilities:
Deposits	5,955,498	5,168,399
Short-term subordinated debt	64,922	64,922
FHLB advances	1,425,888	771,029
Other borrowing	232,934	7,934
Credit linked notes	111,828	119,878
Interest payable	51,790	43,423
Level 3 | Estimated fair value
Financial assets:
Securities held to maturity	709,605	719,247
Loans receivable, net	$ 10,646,477	$ 10,088,468

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