Fair Value of Assets and Liabilities - Fair Value Measurements on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Financial Assets
Debt securities, available-for-sale	$ 5,198,313	$ 5,307,307
Recurring Measurements
Financial Assets
Loans held for sale, at fair value	14,461	12,314
Total assets measured at fair value on a recurring basis	5,220,211	5,327,740
Total financial liabilities	170	188
Interest rate caps \| Recurring Measurements
Financial Assets
Derivative assets	6,705	7,757
Interest rate locks \| Recurring Measurements
Financial Assets
Derivative assets	732	362
TBA hedge
Financial Assets
TBA hedge
TBA hedge \| Recurring Measurements
Financial Assets
TBA hedge	170	188
U.S. government and federal agency \| Recurring Measurements
Financial Assets
Debt securities, available-for-sale	450,228	444,727
U.S. government sponsored enterprises \| Recurring Measurements
Financial Assets
Debt securities, available-for-sale	292,632	287,364
State and local governments \| Recurring Measurements
Financial Assets
Debt securities, available-for-sale	102,678	132,993
Corporate bonds \| Recurring Measurements
Financial Assets
Debt securities, available-for-sale	26,122	26,109
Residential mortgage-backed securities \| Recurring Measurements
Financial Assets
Debt securities, available-for-sale	3,179,568	3,267,341
Commercial mortgage-backed securities \| Recurring Measurements
Financial Assets
Debt securities, available-for-sale	1,147,085	1,148,773
Level 1 \| Recurring Measurements
Financial Assets
Loans held for sale, at fair value	0	0
Total assets measured at fair value on a recurring basis	0	0
Total financial liabilities	0	0
Level 1 \| Interest rate caps \| Recurring Measurements
Financial Assets
Derivative assets	0	0
Level 1 \| Interest rate locks \| Recurring Measurements
Financial Assets
Derivative assets	0	0
Level 1 \| TBA hedge \| Recurring Measurements
Financial Assets
TBA hedge	0	0
Level 1 \| U.S. government and federal agency \| Recurring Measurements
Financial Assets
Debt securities, available-for-sale	0	0
Level 1 \| U.S. government sponsored enterprises \| Recurring Measurements
Financial Assets
Debt securities, available-for-sale	0	0
Level 1 \| State and local governments \| Recurring Measurements
Financial Assets
Debt securities, available-for-sale	0	0
Level 1 \| Corporate bonds \| Recurring Measurements
Financial Assets
Debt securities, available-for-sale	0	0
Level 1 \| Residential mortgage-backed securities \| Recurring Measurements
Financial Assets
Debt securities, available-for-sale	0	0
Level 1 \| Commercial mortgage-backed securities \| Recurring Measurements
Financial Assets
Debt securities, available-for-sale	0	0
Level 2 \| Recurring Measurements
Financial Assets
Loans held for sale, at fair value	14,461	12,314
Total assets measured at fair value on a recurring basis	5,220,211	5,327,740
Total financial liabilities	170	188
Level 2 \| Interest rate caps \| Recurring Measurements
Financial Assets
Derivative assets	6,705	7,757
Level 2 \| Interest rate locks \| Recurring Measurements
Financial Assets
Derivative assets	732	362
Level 2 \| TBA hedge \| Recurring Measurements
Financial Assets
TBA hedge	170	188
Level 2 \| U.S. government and federal agency \| Recurring Measurements
Financial Assets
Debt securities, available-for-sale	450,228	444,727
Level 2 \| U.S. government sponsored enterprises \| Recurring Measurements
Financial Assets
Debt securities, available-for-sale	292,632	287,364
Level 2 \| State and local governments \| Recurring Measurements
Financial Assets
Debt securities, available-for-sale	102,678	132,993
Level 2 \| Corporate bonds \| Recurring Measurements
Financial Assets
Debt securities, available-for-sale	26,122	26,109
Level 2 \| Residential mortgage-backed securities \| Recurring Measurements
Financial Assets
Debt securities, available-for-sale	3,179,568	3,267,341
Level 2 \| Commercial mortgage-backed securities \| Recurring Measurements
Financial Assets
Debt securities, available-for-sale	1,147,085	1,148,773
Level 3 \| Recurring Measurements
Financial Assets
Loans held for sale, at fair value	0	0
Total assets measured at fair value on a recurring basis	0	0
Total financial liabilities	0	0
Level 3 \| Interest rate caps \| Recurring Measurements
Financial Assets
Derivative assets	0	0
Level 3 \| Interest rate locks \| Recurring Measurements
Financial Assets
Derivative assets	0	0
Level 3 \| TBA hedge \| Recurring Measurements
Financial Assets
TBA hedge	0	0
Level 3 \| U.S. government and federal agency \| Recurring Measurements
Financial Assets
Debt securities, available-for-sale	0	0
Level 3 \| U.S. government sponsored enterprises \| Recurring Measurements
Financial Assets
Debt securities, available-for-sale	0	0
Level 3 \| State and local governments \| Recurring Measurements
Financial Assets
Debt securities, available-for-sale	0	0
Level 3 \| Corporate bonds \| Recurring Measurements
Financial Assets
Debt securities, available-for-sale	0	0
Level 3 \| Residential mortgage-backed securities \| Recurring Measurements
Financial Assets
Debt securities, available-for-sale	0	0
Level 3 \| Commercial mortgage-backed securities \| Recurring Measurements
Financial Assets
Debt securities, available-for-sale	$ 0	$ 0

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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