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Securities - Schedule of Estimated Fair Value and Unrealized Losses for Debt Securities Available-for-Sale and Held-to-Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Debt securities available-for-sale:    
Available-for-sale, Less than 12 months, Estimated Fair Value $ 192,500 $ 171,376
Available-for-sale, Less than 12 months, Unrealized Losses (295) (264)
Available-for-sale, 12 months or Longer, Estimated Fair Value 242,833 451,856
Available-for-sale, 12 months or longer, Unrealized Losses (16,916) (26,117)
Available-for-sale, Total, Estimated Fair Value 435,333 623,232
Available-for-sale, Total, Unrealized Losses (17,211) (26,381)
Debt securities held-to-maturity:    
Held-to-maturity, Less than 12 months, Estimated Fair Value 6,317 124,433
Held-to-maturity, Less than 12 months, Unrealized Losses (371) (1,559)
Held-to-maturity, 12 months or longer, Estimated Fair Value 821,120 849,609
Held-to-maturity, 12 months or longer, Unrealized Losses (70,994) (92,424)
Held To Maturity Securities Continuous Unrealized Loss Position Fair Value1 827,437 974,042
Held-to-maturity, total, unrealized losses (71,365) (93,983)
Total securities, Less than 12 months, Estimated Fair Value 198,817 295,809
Total securities, Less than 12 months, Unrealized Losses (666) (1,823)
Total securities, 12 months or longer, Estimated Fair Value 1,063,953 1,301,465
Total securities, 12 months or longer, Unrealized Losses (87,910) (118,541)
Total securities, Estimated Fair Value 1,262,770 1,597,274
Total securities, Unrealized Losses (88,576) (120,364)
Mortgage-backed securities:    
Debt securities available-for-sale:    
Available-for-sale, Less than 12 months, Estimated Fair Value 143,284 169,000
Available-for-sale, Less than 12 months, Unrealized Losses (195) (97)
Available-for-sale, 12 months or Longer, Estimated Fair Value 96,970 94,335
Available-for-sale, 12 months or longer, Unrealized Losses (11,895) (15,255)
Available-for-sale, Total, Estimated Fair Value 240,254 263,335
Available-for-sale, Total, Unrealized Losses (12,090) (15,352)
Debt securities held-to-maturity:    
Held-to-maturity, Less than 12 months, Estimated Fair Value 1,276 114,678
Held-to-maturity, Less than 12 months, Unrealized Losses (10) (1,063)
Held-to-maturity, 12 months or longer, Estimated Fair Value 607,246 599,712
Held-to-maturity, 12 months or longer, Unrealized Losses (59,309) (74,429)
Held To Maturity Securities Continuous Unrealized Loss Position Fair Value1 608,522 714,390
Held-to-maturity, total, unrealized losses (59,319) (75,492)
U.S. government and agency obligations | Investment securities    
Debt securities available-for-sale:    
Available-for-sale, Less than 12 months, Estimated Fair Value 2,103 833
Available-for-sale, Less than 12 months, Unrealized Losses (6) (2)
Available-for-sale, 12 months or Longer, Estimated Fair Value 50,871 59,861
Available-for-sale, 12 months or longer, Unrealized Losses (4,173) (5,794)
Available-for-sale, Total, Estimated Fair Value 52,974 60,694
Available-for-sale, Total, Unrealized Losses (4,179) (5,796)
Corporate debt securities    
Debt securities held-to-maturity:    
Held-to-maturity, total, unrealized losses (1,378) (3,941)
Corporate debt securities | Investment securities    
Debt securities available-for-sale:    
Available-for-sale, Less than 12 months, Estimated Fair Value 4,788 1,543
Available-for-sale, Less than 12 months, Unrealized Losses (54) (165)
Available-for-sale, 12 months or Longer, Estimated Fair Value 5,988 6,116
Available-for-sale, 12 months or longer, Unrealized Losses (741) (816)
Available-for-sale, Total, Estimated Fair Value 10,776 7,659
Available-for-sale, Total, Unrealized Losses (795) (981)
Debt securities held-to-maturity:    
Held-to-maturity, Less than 12 months, Estimated Fair Value 0 3,084
Held-to-maturity, Less than 12 months, Unrealized Losses 0 (473)
Held-to-maturity, 12 months or longer, Estimated Fair Value 38,713 58,386
Held-to-maturity, 12 months or longer, Unrealized Losses (1,378) (3,468)
Held To Maturity Securities Continuous Unrealized Loss Position Fair Value1 38,713 61,470
Held-to-maturity, total, unrealized losses (1,378) (3,941)
Asset-backed securities | Investment securities    
Debt securities available-for-sale:    
Available-for-sale, Less than 12 months, Estimated Fair Value 42,325 0
Available-for-sale, Less than 12 months, Unrealized Losses (40) 0
Available-for-sale, 12 months or Longer, Estimated Fair Value 89,004 291,544
Available-for-sale, 12 months or longer, Unrealized Losses (107) (4,252)
Available-for-sale, Total, Estimated Fair Value 131,329 291,544
Available-for-sale, Total, Unrealized Losses (147) (4,252)
Agency residential    
Debt securities held-to-maturity:    
Held-to-maturity, total, unrealized losses (54,907) (70,040)
Agency residential | Mortgage-backed securities:    
Debt securities available-for-sale:    
Available-for-sale, Less than 12 months, Estimated Fair Value 143,284 169,000
Available-for-sale, Less than 12 months, Unrealized Losses (195) (97)
Available-for-sale, 12 months or Longer, Estimated Fair Value 0 0
Available-for-sale, 12 months or longer, Unrealized Losses 0 0
Available-for-sale, Total, Estimated Fair Value 143,284 169,000
Available-for-sale, Total, Unrealized Losses (195) (97)
Debt securities held-to-maturity:    
Held-to-maturity, Less than 12 months, Estimated Fair Value 0 95,776
Held-to-maturity, Less than 12 months, Unrealized Losses 0 (693)
Held-to-maturity, 12 months or longer, Estimated Fair Value 514,518 525,751
Held-to-maturity, 12 months or longer, Unrealized Losses (54,907) (69,347)
Held To Maturity Securities Continuous Unrealized Loss Position Fair Value1 514,518 621,527
Held-to-maturity, total, unrealized losses (54,907) (70,040)
Agency commercial    
Debt securities held-to-maturity:    
Held-to-maturity, total, unrealized losses (3,435) (3,678)
Agency commercial | Mortgage-backed securities:    
Debt securities available-for-sale:    
Available-for-sale, Less than 12 months, Estimated Fair Value 0 0
Available-for-sale, Less than 12 months, Unrealized Losses 0 0
Available-for-sale, 12 months or Longer, Estimated Fair Value 96,970 94,335
Available-for-sale, 12 months or longer, Unrealized Losses (11,895) (15,255)
Available-for-sale, Total, Estimated Fair Value 96,970 94,335
Available-for-sale, Total, Unrealized Losses (11,895) (15,255)
Debt securities held-to-maturity:    
Held-to-maturity, Less than 12 months, Estimated Fair Value 1,276 18,902
Held-to-maturity, Less than 12 months, Unrealized Losses (10) (370)
Held-to-maturity, 12 months or longer, Estimated Fair Value 73,251 55,051
Held-to-maturity, 12 months or longer, Unrealized Losses (3,425) (3,308)
Held To Maturity Securities Continuous Unrealized Loss Position Fair Value1 74,527 73,953
Held-to-maturity, total, unrealized losses (3,435) (3,678)
State and municipal debt obligations    
Debt securities held-to-maturity:    
Held-to-maturity, total, unrealized losses (10,668) (14,550)
State and municipal debt obligations | Investment securities    
Debt securities held-to-maturity:    
Held-to-maturity, Less than 12 months, Estimated Fair Value 5,041 6,671
Held-to-maturity, Less than 12 months, Unrealized Losses (361) (23)
Held-to-maturity, 12 months or longer, Estimated Fair Value 175,161 191,511
Held-to-maturity, 12 months or longer, Unrealized Losses (10,307) (14,527)
Held To Maturity Securities Continuous Unrealized Loss Position Fair Value1 180,202 198,182
Held-to-maturity, total, unrealized losses (10,668) (14,550)
Non-agency commercial    
Debt securities held-to-maturity:    
Held-to-maturity, total, unrealized losses (977) (1,774)
Non-agency commercial | Mortgage-backed securities:    
Debt securities held-to-maturity:    
Held-to-maturity, Less than 12 months, Estimated Fair Value 0 0
Held-to-maturity, Less than 12 months, Unrealized Losses 0 0
Held-to-maturity, 12 months or longer, Estimated Fair Value 19,477 18,910
Held-to-maturity, 12 months or longer, Unrealized Losses (977) (1,774)
Held To Maturity Securities Continuous Unrealized Loss Position Fair Value1 19,477 18,910
Held-to-maturity, total, unrealized losses $ (977) $ (1,774)