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Investment Securities - Amortized Cost and Fair Value, by Contractual Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 19,884 |
Due after one year through five years | 60,651 |
Due after five years through ten years | 172,717 |
Due after ten years | 164,865 |
Total contractual maturities | 418,117 |
Available-for-sale investment securities, amortized cost | 3,172,031 | $ 3,549,599
Fair Value |  |
Due in one year or less | 19,534 |
Due after one year through five years | 57,469 |
Due after five years through ten years | 161,989 |
Due after ten years | 162,151 |
Total contractual maturities | 401,143 |
Total available-for-sale securities, Fair value, | 2,722,704 | 3,151,133
Amortized Cost |  |
Due after five years through ten years | 10,280 |
Due after ten years | 96,929 |
Total contractual maturities | 107,209 |
Amortized cost | 4,104,114 | 4,320,639
Fair Value |  |
Due after five years through ten years | 8,732 |
Due after ten years | 81,149 |
Total contractual maturities | 89,881 |
Total held to maturity, Fair value, | 3,433,029 | 3,814,822
Mortgage-backed securities: |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,613,490 |
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,354,961 |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,308,835 |
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,079,586 |
Residential - Government agency |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 61,768 |
Available-for-sale investment securities, amortized cost | 61,768 | 66,792
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 52,362 |
Total available-for-sale securities, Fair value, | 52,362 | 59,723
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 44,379 |
Amortized cost | 44,379 | 46,302
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 36,355 |
Total held to maturity, Fair value, | 36,355 | 40,008
Residential - Government-sponsored enterprises |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,185,269 |
Available-for-sale investment securities, amortized cost | 1,185,269 | 1,317,718
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,005,782 |
Total available-for-sale securities, Fair value, | 1,005,782 | 1,160,455
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 100,905 |
Amortized cost | 100,905 | 106,534
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 82,754 |
Total held to maturity, Fair value, | 82,754 | 93,556
Commercial - Government agency |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 272,432 |
Available-for-sale investment securities, amortized cost | 272,432 | 282,700
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 211,897 |
Total available-for-sale securities, Fair value, | 211,897 | 237,853
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 30,733 |
Amortized cost | 30,733 | 30,544
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 21,977 |
Total held to maturity, Fair value, | 21,977 | 25,315
Commercial - Government-sponsored enterprises |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 94,021 |
Available-for-sale investment securities, amortized cost | 94,021 | 130,612
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 84,920 |
Total available-for-sale securities, Fair value, | 84,920 | 119,573
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,132,818 |
Amortized cost | 1,132,818 | 1,150,449
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 938,500 |
Total held to maturity, Fair value, | 938,500 | 1,011,998
Collateralized mortgage obligations |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,140,424 |
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 966,600 |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 2,688,070 |
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 2,263,562 |
Government agency |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 661,207 |
Available-for-sale investment securities, amortized cost | 661,207 | 738,524
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 565,852 |
Total available-for-sale securities, Fair value, | 565,852 | 653,322
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,010,551 |
Amortized cost | 1,010,551 | 1,080,492
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 857,291 |
Total held to maturity, Fair value, | 857,291 | 958,114
Government-sponsored enterprises |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 479,217 |
Available-for-sale investment securities, amortized cost | 479,217 | 533,103
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 400,748 |
Total available-for-sale securities, Fair value, | 400,748 | 462,132
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,677,519 |
Amortized cost | 1,677,519 | 1,798,178
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,406,271 |
Total held to maturity, Fair value, | $ 1,406,271 | $ 1,591,133

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