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Securities - Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Amortized Cost
Due within one year	$ 420
Due after one year through five years	5,649
Due after five years through ten years	180,726
Due after ten years	93,741
Amortized Cost	1,051,916	$ 1,126,144
Fair Value
Due within one year	420
Due after one year through five years	5,427
Due after five years through ten years	161,444
Due after ten years	79,686
Fair Value	976,690	1,002,544
Amortized Cost
Due within one year	9,797
Due after one year through five years	76,154
Due after five years through ten years	121,374
Due after ten years	119,660
Amortized Cost	2,599,397	968,927
Fair Value
Due within one year	9,815
Due after one year through five years	76,555
Due after five years through ten years	121,260
Due after ten years	121,614
Fair Value	2,512,650	831,013
Residential mortgage backed securities:
Amortized Cost
Amortized Cost	327,592	354,882
Fair Value
Fair Value	308,063	313,376
Other debt securities
Amortized Cost
Without single maturity date, amortized cost	48,090
Amortized Cost	48,090	53,683
Fair Value
Without single maturity date, fair value	45,650
Fair Value	45,650	49,603
Amortized Cost
Debt securities, without fixed maturity, amortized cost	308,184
Amortized Cost	364,473	130,175
Fair Value
Debt securities, without fixed maturity, fair value	306,510
Fair Value	362,105	127,960
Mortgage backed securities issued by U.S. Government agencies or sponsored enterprises | Residential mortgage backed securities:
Amortized Cost
Without single maturity date, amortized cost	336,382
Amortized Cost	336,382	372,414
Fair Value
Without single maturity date, fair value	324,998
Fair Value	324,998	347,163
Amortized Cost
Debt securities, without fixed maturity, amortized cost	710,105
Amortized Cost	710,105	185,292
Fair Value
Debt securities, without fixed maturity, fair value	696,306
Fair Value	696,306	160,905
Mortgage backed securities issued by U.S. Government agencies or sponsored enterprises | Commercial mortgage backed securities:
Amortized Cost
Without single maturity date, amortized cost	16,944
Amortized Cost	16,944	16,961
Fair Value
Without single maturity date, fair value	14,759
Fair Value	14,759	14,003
Amortized Cost
Debt securities, without fixed maturity, amortized cost	100,337
Amortized Cost	100,337	11,373
Fair Value
Debt securities, without fixed maturity, fair value	99,759
Fair Value	99,759	10,622
Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises | Residential mortgage backed securities:
Amortized Cost
Without single maturity date, amortized cost	327,592
Fair Value
Without single maturity date, fair value	308,063
Amortized Cost
Debt securities, without fixed maturity, amortized cost	739,005
Amortized Cost	739,005	475,311
Fair Value
Debt securities, without fixed maturity, fair value	682,080
Fair Value	682,080	388,516
Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises | Commercial mortgage backed securities:
Amortized Cost
Without single maturity date, amortized cost	42,372
Amortized Cost	42,372	43,662
Fair Value
Without single maturity date, fair value	36,243
Fair Value	36,243	36,345
Amortized Cost
Debt securities, without fixed maturity, amortized cost	414,781
Amortized Cost	414,781	146,510
Fair Value
Debt securities, without fixed maturity, fair value	398,751
Fair Value	$ 398,751	$ 124,956

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