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Investment Securities - Amortized Cost and Fair Value, by Contractual Maturity (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 44,820 |
Due after one year through five years | 60,590 |
Due after five years through ten years | 175,172 |
Due after ten years | 164,865 |
Total contractual maturities | 445,447 |
Available-for-sale investment securities, amortized cost | 3,296,825 | $ 3,549,599
Fair Value |  |
Due in one year or less | 44,242 |
Due after one year through five years | 57,478 |
Due after five years through ten years | 162,622 |
Due after ten years | 158,776 |
Total contractual maturities | 423,118 |
Total available-for-sale securities, Fair value, | 2,909,372 | 3,151,133
Amortized Cost |  |
Due after five years through ten years | 10,255 |
Due after ten years | 96,941 |
Total contractual maturities | 107,196 |
Amortized cost | 4,180,408 | 4,320,639
Fair Value |  |
Due after five years through ten years | 9,264 |
Due after ten years | 86,271 |
Total contractual maturities | 95,535 |
Total held to maturity, Fair value, | 3,697,261 | 3,814,822
Mortgage-backed securities: |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,665,667 |
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,453,553 |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,315,869 |
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,162,339 |
Residential - Government agency |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 63,486 |
Available-for-sale investment securities, amortized cost | 63,486 | 66,792
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 57,202 |
Total available-for-sale securities, Fair value, | 57,202 | 59,723
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 45,097 |
Amortized cost | 45,097 | 46,302
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 39,613 |
Total held to maturity, Fair value, | 39,613 | 40,008
Residential - Government-sponsored enterprises |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,229,375 |
Available-for-sale investment securities, amortized cost | 1,229,375 | 1,317,718
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,082,992 |
Total available-for-sale securities, Fair value, | 1,082,992 | 1,160,455
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 102,940 |
Amortized cost | 102,940 | 106,534
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 91,042 |
Total held to maturity, Fair value, | 91,042 | 93,556
Commercial - Government agency |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 276,365 |
Available-for-sale investment securities, amortized cost | 276,365 | 282,700
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 225,462 |
Total available-for-sale securities, Fair value, | 225,462 | 237,853
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 30,675 |
Amortized cost | 30,675 | 30,544
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 24,294 |
Total held to maturity, Fair value, | 24,294 | 25,315
Commercial - Government-sponsored enterprises |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 96,441 |
Available-for-sale investment securities, amortized cost | 96,441 | 130,612
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 87,897 |
Total available-for-sale securities, Fair value, | 87,897 | 119,573
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,137,157 |
Amortized cost | 1,137,157 | 1,150,449
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,007,390 |
Total held to maturity, Fair value, | 1,007,390 | 1,011,998
Collateralized mortgage obligations |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,185,711 |
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,032,701 |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 2,757,343 |
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 2,439,387 |
Government agency |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 688,844 |
Available-for-sale investment securities, amortized cost | 688,844 | 738,524
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 605,221 |
Total available-for-sale securities, Fair value, | 605,221 | 653,322
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,036,671 |
Amortized cost | 1,036,671 | 1,080,492
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 917,165 |
Total held to maturity, Fair value, | 917,165 | 958,114
Government-sponsored enterprises |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 496,867 |
Available-for-sale investment securities, amortized cost | 496,867 | 533,103
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 427,480 |
Total available-for-sale securities, Fair value, | 427,480 | 462,132
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,720,672 |
Amortized cost | 1,720,672 | 1,798,178
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,522,222 |
Total held to maturity, Fair value, | $ 1,522,222 | $ 1,591,133

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