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Securities - Contractual Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Amortized Cost |  |
Due within one year | $ 0 |
Due after one year through five years | 3,265 |
Due after five years through ten years | 75,045 |
Due after ten years | 210,743 |
Amortized Cost | 1,245,627 | $ 1,324,072
Fair Value |  |
Due within one year | 0 |
Due after one year through five years | 3,044 |
Due after five years through ten years | 62,072 |
Due after ten years | 166,277 |
Fair Value | 1,079,123 | 1,206,540
Amortized Cost |  |
Due within one year | 6,482 |
Due after one year through five years | 36,332 |
Due after five years through ten years | 42,481 |
Due after ten years | 16,688 |
Amortized Cost | 1,105,472 | 1,735,000
Fair Value |  |
Due within one year | 6,402 |
Due after one year through five years | 36,386 |
Due after five years through ten years | 36,784 |
Due after ten years | 13,887 |
Fair Value | 909,108 | 1,533,942
Residential mortgage backed securities: |  |
Amortized Cost |  |
Amortized Cost | 395,441 | 423,315
Fair Value |  |
Fair Value | 346,411 | 392,609
Other debt securities |  |
Amortized Cost |  |
Without single maturity date, amortized cost | 59,192 |
Amortized Cost | 59,192 | 62,875
Fair Value |  |
Without single maturity date, fair value | 52,763 |
Fair Value | 52,763 | 58,609
Amortized Cost |  |
Debt securities, without fixed maturity, amortized cost | 8,603 |
Amortized Cost | 72,386 | 74,885
Fair Value |  |
Debt securities, without fixed maturity, fair value | 7,435 |
Fair Value | 67,355 | 70,836
Government agency mortgage backed securities | Residential mortgage backed securities: |  |
Amortized Cost |  |
Without single maturity date, amortized cost | 440,227 |
Amortized Cost | 440,227 | 483,560
Fair Value |  |
Without single maturity date, fair value | 398,877 |
Fair Value | 398,877 | 459,128
Amortized Cost |  |
Debt securities, without fixed maturity, amortized cost | 321,245 |
Amortized Cost | 321,245 | 508,415
Fair Value |  |
Debt securities, without fixed maturity, fair value | 271,448 |
Fair Value | 271,448 | 456,416
Government agency mortgage backed securities | Commercial mortgage backed securities: |  |
Amortized Cost |  |
Without single maturity date, amortized cost | 16,989 |
Amortized Cost | 16,989 | 17,006
Fair Value |  |
Without single maturity date, fair value | 13,189 |
Fair Value | 13,189 | 13,745
Amortized Cost |  |
Debt securities, without fixed maturity, amortized cost | 6,036 |
Amortized Cost | 6,036 | 11,166
Fair Value |  |
Debt securities, without fixed maturity, fair value | 5,128 |
Fair Value | 5,128 | 10,113
Government agency collateralized mortgage obligations | Residential mortgage backed securities: |  |
Amortized Cost |  |
Without single maturity date, amortized cost | 395,441 |
Fair Value |  |
Without single maturity date, fair value | 346,411 |
Amortized Cost |  |
Debt securities, without fixed maturity, amortized cost | 501,793 |
Amortized Cost | 501,793 | 605,033
Fair Value |  |
Debt securities, without fixed maturity, fair value | 392,897 |
Fair Value | 392,897 | 501,169
Government agency collateralized mortgage obligations | Commercial mortgage backed securities: |  |
Amortized Cost |  |
Without single maturity date, amortized cost | 44,725 |
Amortized Cost | 44,725 | 45,430
Fair Value |  |
Without single maturity date, fair value | 36,490 |
Fair Value | 36,490 | 38,871
Amortized Cost |  |
Debt securities, without fixed maturity, amortized cost | 165,812 |
Amortized Cost | 165,812 | 211,435
Fair Value |  |
Debt securities, without fixed maturity, fair value | 138,741 |
Fair Value | $ 138,741 | $ 185,846

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