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Fair Value of Assets and Liabilities - Fair Value Measurements on a Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Financial Assets    
Debt securities, available-for-sale $ 4,499,541 $ 4,785,719
Recurring Measurements    
Financial Assets    
Loans held for sale, at fair value 39,745 15,691
Total assets measured at fair value on a recurring basis 4,546,387 4,807,004
Total financial liabilities 538 18,338
U.S. government and federal agency    
Financial Assets    
Debt securities, available-for-sale 457,508 455,347
U.S. government and federal agency | Recurring Measurements    
Financial Assets    
Debt securities, available-for-sale 457,508 455,347
U.S. government sponsored enterprises    
Financial Assets    
Debt securities, available-for-sale 301,583 299,219
U.S. government sponsored enterprises | Recurring Measurements    
Financial Assets    
Debt securities, available-for-sale 301,583 299,219
State and local governments    
Financial Assets    
Debt securities, available-for-sale 95,639 98,932
State and local governments | Recurring Measurements    
Financial Assets    
Debt securities, available-for-sale 95,639 98,932
Corporate bonds    
Financial Assets    
Debt securities, available-for-sale 14,240 26,253
Corporate bonds | Recurring Measurements    
Financial Assets    
Debt securities, available-for-sale 14,240 26,253
Residential mortgage-backed securities    
Financial Assets    
Debt securities, available-for-sale 2,558,020 2,811,263
Residential mortgage-backed securities | Recurring Measurements    
Financial Assets    
Debt securities, available-for-sale 2,558,020 2,811,263
Commercial mortgage-backed securities    
Financial Assets    
Debt securities, available-for-sale 1,072,551 1,094,705
Commercial mortgage-backed securities | Recurring Measurements    
Financial Assets    
Debt securities, available-for-sale 1,072,551 1,094,705
Interest rate caps | Recurring Measurements    
Financial Assets    
Derivative assets 3,285 4,990
Interest rate locks | Recurring Measurements    
Financial Assets    
Derivative assets 1,045 604
Interest rate swap | Recurring Measurements    
Financial Assets    
Derivative assets 2,771  
Derivative liabilities 462 17,988
TBA hedge | Recurring Measurements    
Financial Assets    
Derivative liabilities 76 350
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 | 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 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 | Interest rate swap | Recurring Measurements    
Financial Assets    
Derivative assets 0  
Derivative liabilities 0 0
Level 1 | TBA hedge | Recurring Measurements    
Financial Assets    
Derivative liabilities 0 0
Level 2 | Recurring Measurements    
Financial Assets    
Loans held for sale, at fair value 39,745 15,691
Total assets measured at fair value on a recurring basis 4,546,387 4,807,004
Total financial liabilities 538 18,338
Level 2 | U.S. government and federal agency | Recurring Measurements    
Financial Assets    
Debt securities, available-for-sale 457,508 455,347
Level 2 | U.S. government sponsored enterprises | Recurring Measurements    
Financial Assets    
Debt securities, available-for-sale 301,583 299,219
Level 2 | State and local governments | Recurring Measurements    
Financial Assets    
Debt securities, available-for-sale 95,639 98,932
Level 2 | Corporate bonds | Recurring Measurements    
Financial Assets    
Debt securities, available-for-sale 14,240 26,253
Level 2 | Residential mortgage-backed securities | Recurring Measurements    
Financial Assets    
Debt securities, available-for-sale 2,558,020 2,811,263
Level 2 | Commercial mortgage-backed securities | Recurring Measurements    
Financial Assets    
Debt securities, available-for-sale 1,072,551 1,094,705
Level 2 | Interest rate caps | Recurring Measurements    
Financial Assets    
Derivative assets 3,285 4,990
Level 2 | Interest rate locks | Recurring Measurements    
Financial Assets    
Derivative assets 1,045 604
Level 2 | Interest rate swap | Recurring Measurements    
Financial Assets    
Derivative assets 2,771  
Derivative liabilities 462 17,988
Level 2 | TBA hedge | Recurring Measurements    
Financial Assets    
Derivative liabilities 76 350
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 | 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
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 | Interest rate swap | Recurring Measurements    
Financial Assets    
Derivative assets 0  
Derivative liabilities 0 0
Level 3 | TBA hedge | Recurring Measurements    
Financial Assets    
Derivative liabilities $ 0 $ 0