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Investment Securities - Aggregate Unrealized Losses and Fair Value (Details)
$ in Thousands
Dec. 31, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
security
Number  of Securities    
Less than 12 months | security 38 20
12 months or longer | security 261 301
Total | security 299 321
Fair  Value    
Less than 12 months $ 231,698 $ 115,815
12 months or longer 1,452,638 1,738,084
Total 1,684,336 1,853,899
Gross Unrealized Losses    
Less than 12 months (7,324) (2,770)
12 months or longer (292,450) (288,178)
Total $ (299,774) $ (290,948)
U.S. Treasury securities    
Number  of Securities    
Less than 12 months | security   0
12 months or longer | security   1
Total | security   1
Fair  Value    
Less than 12 months   $ 0
12 months or longer   3,963
Total   3,963
Gross Unrealized Losses    
Less than 12 months   0
12 months or longer   (35)
Total   $ (35)
Agency securities    
Number  of Securities    
Less than 12 months | security 0 0
12 months or longer | security 1 1
Total | security 1 1
Fair  Value    
Less than 12 months $ 0 $ 0
12 months or longer 3,957 3,900
Total 3,957 3,900
Gross Unrealized Losses    
Less than 12 months 0 0
12 months or longer (43) (100)
Total $ (43) $ (100)
Collateralized mortgage obligations    
Number  of Securities    
Less than 12 months | security 7 3
12 months or longer | security 95 115
Total | security 102 118
Fair  Value    
Less than 12 months $ 59,661 $ 19,800
12 months or longer 636,472 717,662
Total 696,133 737,462
Gross Unrealized Losses    
Less than 12 months (527) (378)
12 months or longer (138,898) (140,901)
Total $ (139,425) $ (141,279)
Residential    
Number  of Securities    
Less than 12 months | security 2 0
12 months or longer | security 63 65
Total | security 65 65
Fair  Value    
Less than 12 months $ 19,183 $ 0
12 months or longer 367,877 420,298
Total 387,060 420,298
Gross Unrealized Losses    
Less than 12 months (1,029) 0
12 months or longer (85,010) (79,133)
Total $ (86,039) $ (79,133)
Commercial    
Number  of Securities    
Less than 12 months | security 10 6
12 months or longer | security 57 53
Total | security 67 59
Fair  Value    
Less than 12 months $ 70,728 $ 53,255
12 months or longer 340,123 331,450
Total 410,851 384,705
Gross Unrealized Losses    
Less than 12 months (2,406) (2,129)
12 months or longer (53,672) (51,303)
Total $ (56,078) $ (53,432)
Asset-backed securities    
Number  of Securities    
Less than 12 months | security 1 0
12 months or longer | security 0 18
Total | security 1 18
Fair  Value    
Less than 12 months $ 5,007 $ 0
12 months or longer 0 149,670
Total 5,007 149,670
Gross Unrealized Losses    
Less than 12 months (14) 0
12 months or longer 0 (1,322)
Total $ (14) $ (1,322)
Corporate securities    
Number  of Securities    
Less than 12 months | security 0 0
12 months or longer | security 6 6
Total | security 6 6
Fair  Value    
Less than 12 months $ 0 $ 0
12 months or longer 20,694 19,434
Total 20,694 19,434
Gross Unrealized Losses    
Less than 12 months 0 0
12 months or longer (2,560) (3,868)
Total $ (2,560) $ (3,868)
Municipal securities    
Number  of Securities    
Less than 12 months | security 18 11
12 months or longer | security 39 42
Total | security 57 53
Fair  Value    
Less than 12 months $ 77,119 $ 42,760
12 months or longer 83,515 91,707
Total 160,634 134,467
Gross Unrealized Losses    
Less than 12 months (3,348) (263)
12 months or longer (12,267) (11,516)
Total $ (15,615) $ (11,779)