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Securities - Debt Securities Available-for-Sale in Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Debt Securities, Available-for-Sale [Line Items]    
Securities in unrealized loss position, less than 12 months, fair value $ 122,441 $ 138,823
Securities in unrealized loss position, less than 12 months, unrealized losses 1,588 3,431
Securities in unrealized loss position, 12 months or more, fair value 954,081 904,795
Securities in unrealized loss position, 12 months or more, unrealized losses 118,889 108,510
Securities in unrealized loss position, total, fair value 1,076,522 1,043,618
Securities in unrealized loss position, total, unrealized losses 120,477 111,941
U.S. government agencies    
Debt Securities, Available-for-Sale [Line Items]    
Securities in unrealized loss position, less than 12 months, fair value 0 0
Securities in unrealized loss position, less than 12 months, unrealized losses 0 0
Securities in unrealized loss position, 12 months or more, fair value 14,741 15,057
Securities in unrealized loss position, 12 months or more, unrealized losses 340 282
Securities in unrealized loss position, total, fair value 14,741 15,057
Securities in unrealized loss position, total, unrealized losses 340 282
Mortgage-backed securities    
Debt Securities, Available-for-Sale [Line Items]    
Securities in unrealized loss position, less than 12 months, fair value 122,441 138,823
Securities in unrealized loss position, less than 12 months, unrealized losses 1,588 3,431
Securities in unrealized loss position, 12 months or more, fair value 936,335 886,699
Securities in unrealized loss position, 12 months or more, unrealized losses 118,359 108,067
Securities in unrealized loss position, total, fair value 1,058,776 1,025,522
Securities in unrealized loss position, total, unrealized losses 119,947 111,498
Municipal bonds    
Debt Securities, Available-for-Sale [Line Items]    
Securities in unrealized loss position, less than 12 months, fair value 0 0
Securities in unrealized loss position, less than 12 months, unrealized losses 0 0
Securities in unrealized loss position, 12 months or more, fair value 3,005 3,039
Securities in unrealized loss position, 12 months or more, unrealized losses 190 161
Securities in unrealized loss position, total, fair value 3,005 3,039
Securities in unrealized loss position, total, unrealized losses $ 190 $ 161