Fair Value of Financial Instruments - Balances and Levels of Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Financial assets:
Available-for-sale securities:	$ 1,683,525	$ 1,678,525
Equity securities	3,213	3,367
Mortgage-backed securities - residential
Financial assets:
Available-for-sale securities:	1,232,256	1,269,372
Mortgage-backed securities - commercial
Financial assets:
Available-for-sale securities:	14,307	15,250
Municipal securities
Financial assets:
Available-for-sale securities:	310,138	338,610
Treasury securities
Financial assets:
Available-for-sale securities:	80,173	14,908
Corporate securities
Financial assets:
Available-for-sale securities:	7,769	6,515
Recurring Basis
Financial assets:
Equity securities	3,213	3,367
Total securities	1,686,738	1,681,892
Loans held for sale	396,728	752,223
Mortgage servicing rights	144,675	115,512
Derivatives	38,180	27,384
Financial liabilities:
Derivatives	33,029	21,000
Recurring Basis \| U.S. government agency securities
Financial assets:
Available-for-sale securities:	38,882	33,870
Recurring Basis \| Mortgage-backed securities - residential
Financial assets:
Available-for-sale securities:	1,232,256	1,269,372
Recurring Basis \| Mortgage-backed securities - commercial
Financial assets:
Available-for-sale securities:	14,307	15,250
Recurring Basis \| Municipal securities
Financial assets:
Available-for-sale securities:	310,138	338,610
Recurring Basis \| Treasury securities
Financial assets:
Available-for-sale securities:	80,173	14,908
Recurring Basis \| Corporate securities
Financial assets:
Available-for-sale securities:	7,769	6,515
Recurring Basis \| Quoted prices in active markets for identical assets (liabilities) (level 1)
Financial assets:
Equity securities	0	0
Total securities	0	0
Loans held for sale	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) \| 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	3,213	3,367
Total securities	1,686,738	1,681,892
Loans held for sale	318,549	672,924
Mortgage servicing rights	0	0
Derivatives	38,180	27,384
Financial liabilities:
Derivatives	33,029	21,000
Recurring Basis \| Significant other observable inputs (level 2) \| U.S. government agency securities
Financial assets:
Available-for-sale securities:	38,882	33,870
Recurring Basis \| Significant other observable inputs (level 2) \| Mortgage-backed securities - residential
Financial assets:
Available-for-sale securities:	1,232,256	1,269,372
Recurring Basis \| Significant other observable inputs (level 2) \| Mortgage-backed securities - commercial
Financial assets:
Available-for-sale securities:	14,307	15,250
Recurring Basis \| Significant other observable inputs (level 2) \| Municipal securities
Financial assets:
Available-for-sale securities:	310,138	338,610
Recurring Basis \| Significant other observable inputs (level 2) \| Treasury securities
Financial assets:
Available-for-sale securities:	80,173	14,908
Recurring Basis \| Significant other observable inputs (level 2) \| Corporate securities
Financial assets:
Available-for-sale securities:	7,769	6,515
Recurring Basis \| Significant unobservable inputs (level 3)
Financial assets:
Equity securities	0	0
Total securities	0	0
Loans held for sale	78,179	79,299
Mortgage servicing rights	144,675	115,512
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) \| 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

Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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