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Investment Securities (Contractual Maturities of Investment Securities) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Jun. 30, 2022
Available-for-sale securities      
Due in one year or less, amortized cost $ 93,724 $ 119,830 $ 55,058
Due in one to five years, amortized cost 138,704 63,644 75,941
Due in five to ten years, amortized cost 41,655 115,734 115,378
Due after ten years, amortized cost 64,452 64,590 68,885
Amortized Cost 4,018,851 3,769,634 3,331,501
Due in one year or less, fair value 93,137 119,275 54,824
Due in one to five years, fair value 126,776 61,701 74,559
Due in five to ten years, fair value 36,315 105,076 109,492
Due after ten years, fair value 57,518 57,478 65,730
Fair Value 3,492,481 3,243,017 2,970,121
Held-to-maturity securities      
Held-to-maturity securities, due in one year or less, amortized cost 2,479 1,340 1,457
Held-to-maturity securities, due in one to five years, amortized cost 102,182 94,705 84,906
Held-to-maturity securities, due in five to ten years, amortized cost 106,708 115,318 105,450
Held-to-maturity securities, due after ten years, amortized cost 362,252 365,510 331,034
Amortized Cost 3,564,879 3,641,055 3,413,552
Less: Allowance for credit losses (406) (488) (83)
Held-to-maturity securities, net of allowance for credit losses 3,564,473 3,640,567 3,413,469
Held-to-maturity securities, due in one year or less, fair value 2,475 1,332 1,458
Held-to-maturity securities, due in one to five years, fair value 96,806 89,093 80,705
Held-to-maturity securities, due in five to ten years, fair value 105,054 113,758 105,491
Held-to-maturity securities, due after ten years, fair value 289,426 288,460 276,214
Fair Value 2,887,891 2,949,821 2,900,269
Mortgage-backed      
Available-for-sale securities      
Mortgage-backed, without single maturity date, amortized cost 3,680,316 3,405,836 3,016,239
Mortgage-backed, without single maturity date, fair value 3,178,735 2,899,487 2,665,516
Held-to-maturity securities      
Mortgage-backed, amortized cost 2,991,258 3,064,182 2,890,705
Mortgage-backed, fair value $ 2,394,130 $ 2,457,178 $ 2,436,401