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Investment Securities (Contractual Maturities of Investment Securities) (Detail) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021
--- | --- | --- | ---
Available-for-sale securities |  |  |
Due in one year or less, amortized cost | $ 48,130 | $ 49,714 | $ 100,140
Due in one to five years, amortized cost | 67,138 | 72,382 | 76,104
Due in five to ten years, amortized cost | 110,960 | 118,358 | 110,125
Due after ten years, amortized cost | 69,329 | 69,200 | 93,055
Amortized Cost | 3,193,741 | 2,316,369 | 2,395,927
Due in one year or less, fair value | 47,945 | 49,822 | 100,361
Due in one to five years, fair value | 66,034 | 73,850 | 78,291
Due in five to ten years, fair value | 105,670 | 117,573 | 110,928
Due after ten years, fair value | 68,416 | 72,560 | 97,596
Fair Value | 2,998,898 | 2,327,793 | 2,430,749
Held-to-maturity securities |  |  |
Held-to-maturity securities, due in one year or less, amortized cost | 1,208 | 2,976 | 6,812
Held-to-maturity securities, due in one to five years, amortized cost | 83,085 | 79,422 | 50,318
Held-to-maturity securities, due in five to ten years, amortized cost | 101,410 | 106,713 | 184,677
Held-to-maturity securities, due after ten years, amortized cost | 303,290 | 222,522 | 187,596
Amortized Cost | 3,435,888 | 2,942,363 | 2,166,518
Less: Allowance for credit losses | (159) | (78) | (99)
Held-to-maturity securities, net of allowance for credit losses | 3,435,729 | 2,942,285 | 2,166,419
Held-to-maturity securities, due in one year or less, fair value | 1,213 | 2,992 | 6,863
Held-to-maturity securities, due in one to five years, fair value | 80,210 | 79,705 | 50,734
Held-to-maturity securities, due in five to ten years, fair value | 102,940 | 112,667 | 191,539
Held-to-maturity securities, due after ten years, fair value | 275,270 | 221,358 | 183,663
Fair Value | 3,146,427 | 2,900,694 | 2,121,065
Mortgage-backed |  |  |
Available-for-sale securities |  |  |
Mortgage-backed, without single maturity date, amortized cost | 2,898,184 | 2,006,715 | 2,016,503
Mortgage-backed, without single maturity date, fair value | 2,710,833 | 2,013,988 | 2,043,573
Held-to-maturity securities |  |  |
Mortgage-backed, amortized cost | 2,946,895 | 2,530,730 | 1,737,115
Mortgage-backed, fair value | $ 2,686,794 | $ 2,483,972 | $ 1,688,266

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