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, 2023	Dec. 31, 2022
Financial assets:
Available-for-sale securities:	$ 1,348,219	$ 1,471,186
Equity securities, at fair value	2,934	2,990
Mortgage-backed securities - residential
Financial assets:
Available-for-sale securities:	871,074	1,034,193
Mortgage-backed securities - commercial
Financial assets:
Available-for-sale securities:	16,677	17,644
Municipal securities
Financial assets:
Available-for-sale securities:	244,611	264,420
U.S. Treasury securities
Financial assets:
Available-for-sale securities:	106,798	107,680
Corporate securities
Financial assets:
Available-for-sale securities:	3,258	7,187
Recurring Basis
Financial assets:
Equity securities, at fair value	2,934	2,990
Total securities	1,351,153	1,474,176
Loans held for sale, at fair value	81,784	113,240
Mortgage servicing rights	172,710	168,365
Derivatives	51,703	48,769
Financial liabilities:
Derivatives	59,025	63,229
Recurring Basis | U.S. government agency securities
Financial assets:
Available-for-sale securities:	105,801	40,062
Recurring Basis | Mortgage-backed securities - residential
Financial assets:
Available-for-sale securities:	871,074	1,034,193
Recurring Basis | Mortgage-backed securities - commercial
Financial assets:
Available-for-sale securities:	16,677	17,644
Recurring Basis | Municipal securities
Financial assets:
Available-for-sale securities:	244,611	264,420
Recurring Basis | U.S. Treasury securities
Financial assets:
Available-for-sale securities:	106,798	107,680
Recurring Basis | Corporate securities
Financial assets:
Available-for-sale securities:	3,258	7,187
Recurring Basis | Quoted prices in active markets for identical assets (liabilities) (level 1)
Financial assets:
Equity securities, at fair value	0	0
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:
Available-for-sale securities:	0	0
Recurring Basis | Quoted prices in active markets for identical assets (liabilities) (level 1) | Mortgage-backed securities - residential
Financial assets:
Available-for-sale securities:	0	0
Recurring Basis | Quoted prices in active markets for identical assets (liabilities) (level 1) | Mortgage-backed securities - commercial
Financial assets:
Available-for-sale securities:	0	0
Recurring Basis | Quoted prices in active markets for identical assets (liabilities) (level 1) | Municipal securities
Financial assets:
Available-for-sale securities:	0	0
Recurring Basis | Quoted prices in active markets for identical assets (liabilities) (level 1) | U.S. Treasury securities
Financial assets:
Available-for-sale securities:	0	0
Recurring Basis | Quoted prices in active markets for identical assets (liabilities) (level 1) | Corporate securities
Financial assets:
Available-for-sale securities:	0	0
Recurring Basis | Significant other observable inputs (level 2)
Financial assets:
Equity securities, at fair value	2,934	2,990
Total securities	1,351,153	1,474,176
Loans held for sale, at fair value	72,524	82,750
Mortgage servicing rights	0	0
Derivatives	51,703	48,769
Financial liabilities:
Derivatives	59,025	63,229
Recurring Basis | Significant other observable inputs (level 2) | U.S. government agency securities
Financial assets:
Available-for-sale securities:	105,801	40,062
Recurring Basis | Significant other observable inputs (level 2) | Mortgage-backed securities - residential
Financial assets:
Available-for-sale securities:	871,074	1,034,193
Recurring Basis | Significant other observable inputs (level 2) | Mortgage-backed securities - commercial
Financial assets:
Available-for-sale securities:	16,677	17,644
Recurring Basis | Significant other observable inputs (level 2) | Municipal securities
Financial assets:
Available-for-sale securities:	244,611	264,420
Recurring Basis | Significant other observable inputs (level 2) | U.S. Treasury securities
Financial assets:
Available-for-sale securities:	106,798	107,680
Recurring Basis | Significant other observable inputs (level 2) | Corporate securities
Financial assets:
Available-for-sale securities:	3,258	7,187
Recurring Basis | Significant unobservable inputs (level 3)
Financial assets:
Equity securities, at fair value	0	0
Total securities	0	0
Loans held for sale, at fair value	9,260	30,490
Mortgage servicing rights	172,710	168,365
Derivatives	0	0
Financial liabilities:
Derivatives	0	0
Recurring Basis | Significant unobservable inputs (level 3) | U.S. government agency securities
Financial assets:
Available-for-sale securities:	0	0
Recurring Basis | Significant unobservable inputs (level 3) | Mortgage-backed securities - residential
Financial assets:
Available-for-sale securities:	0	0
Recurring Basis | Significant unobservable inputs (level 3) | Mortgage-backed securities - commercial
Financial assets:
Available-for-sale securities:	0	0
Recurring Basis | Significant unobservable inputs (level 3) | Municipal securities
Financial assets:
Available-for-sale securities:	0	0
Recurring Basis | Significant unobservable inputs (level 3) | U.S. Treasury securities
Financial assets:
Available-for-sale securities:	0	0
Recurring Basis | Significant unobservable inputs (level 3) | Corporate securities
Financial assets:
Available-for-sale securities:	$ 0	$ 0