Fair Value of Financial Instruments - Schedule of Balances and Levels of Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Financial assets:
AFS debt securities:	$ 1,567,922	$ 1,471,973
Mortgage-backed securities - residential
Financial assets:
AFS debt securities:	879,589	896,971
Mortgage-backed securities - commercial
Financial assets:
AFS debt securities:	16,289	16,961
Municipal securities
Financial assets:
AFS debt securities:	154,229	242,263
U.S. Treasury securities
Financial assets:
AFS debt securities:		108,496
Corporate securities
Financial assets:
AFS debt securities:	982	3,326
Recurring Basis
Financial assets:
Total securities	1,567,922	1,471,973
Loans held for sale, at fair value	72,608	46,618
Mortgage servicing rights	157,097	164,249
Derivatives	26,123	34,738
Financial liabilities:
Derivatives	26,490	38,215
Recurring Basis | U.S. government agency securities
Financial assets:
AFS debt securities:	516,833	203,956
Recurring Basis | Mortgage-backed securities - residential
Financial assets:
AFS debt securities:	879,589	896,971
Recurring Basis | Mortgage-backed securities - commercial
Financial assets:
AFS debt securities:	16,289	16,961
Recurring Basis | Municipal securities
Financial assets:
AFS debt securities:	154,229	242,263
Recurring Basis | U.S. Treasury securities
Financial assets:
AFS debt securities:		108,496
Recurring Basis | Corporate securities
Financial assets:
AFS debt securities:	982	3,326
Recurring Basis | Quoted prices in active markets for identical assets (liabilities) (level 1)
Financial assets:
Total securities	0	0
Loans held for sale, at fair value	0	0
Mortgage servicing rights	0	0
Derivatives	0	0
Financial liabilities:
Derivatives	0	0
Recurring Basis | Quoted prices in active markets for identical assets (liabilities) (level 1) | U.S. government agency securities
Financial assets:
AFS debt securities:	0	0
Recurring Basis | Quoted prices in active markets for identical assets (liabilities) (level 1) | Mortgage-backed securities - residential
Financial assets:
AFS debt securities:	0	0
Recurring Basis | Quoted prices in active markets for identical assets (liabilities) (level 1) | Mortgage-backed securities - commercial
Financial assets:
AFS debt securities:	0	0
Recurring Basis | Quoted prices in active markets for identical assets (liabilities) (level 1) | Municipal securities
Financial assets:
AFS debt securities:	0	0
Recurring Basis | Quoted prices in active markets for identical assets (liabilities) (level 1) | U.S. Treasury securities
Financial assets:
AFS debt securities:		0
Recurring Basis | Quoted prices in active markets for identical assets (liabilities) (level 1) | Corporate securities
Financial assets:
AFS debt securities:	0	0
Recurring Basis | Significant other observable inputs (level 2)
Financial assets:
Total securities	1,567,922	1,471,973
Loans held for sale, at fair value	72,608	46,618
Mortgage servicing rights	0	0
Derivatives	26,123	34,738
Financial liabilities:
Derivatives	26,490	38,215
Recurring Basis | Significant other observable inputs (level 2) | U.S. government agency securities
Financial assets:
AFS debt securities:	516,833	203,956
Recurring Basis | Significant other observable inputs (level 2) | Mortgage-backed securities - residential
Financial assets:
AFS debt securities:	879,589	896,971
Recurring Basis | Significant other observable inputs (level 2) | Mortgage-backed securities - commercial
Financial assets:
AFS debt securities:	16,289	16,961
Recurring Basis | Significant other observable inputs (level 2) | Municipal securities
Financial assets:
AFS debt securities:	154,229	242,263
Recurring Basis | Significant other observable inputs (level 2) | U.S. Treasury securities
Financial assets:
AFS debt securities:		108,496
Recurring Basis | Significant other observable inputs (level 2) | Corporate securities
Financial assets:
AFS debt securities:	982	3,326
Recurring Basis | Significant unobservable inputs (level 3)
Financial assets:
Total securities	0	0
Loans held for sale, at fair value	0	0
Mortgage servicing rights	157,097	164,249
Derivatives	0	0
Financial liabilities:
Derivatives	0	0
Recurring Basis | Significant unobservable inputs (level 3) | U.S. government agency securities
Financial assets:
AFS debt securities:	0	0
Recurring Basis | Significant unobservable inputs (level 3) | Mortgage-backed securities - residential
Financial assets:
AFS debt securities:	0	0
Recurring Basis | Significant unobservable inputs (level 3) | Mortgage-backed securities - commercial
Financial assets:
AFS debt securities:	0	0
Recurring Basis | Significant unobservable inputs (level 3) | Municipal securities
Financial assets:
AFS debt securities:	0	0
Recurring Basis | Significant unobservable inputs (level 3) | U.S. Treasury securities
Financial assets:
AFS debt securities:		0
Recurring Basis | Significant unobservable inputs (level 3) | Corporate securities
Financial assets:
AFS debt securities:	$ 0	$ 0