Investment Securities (Narrative) (Detail)	3 Months Ended
Mar. 31, 2022 USD ($) security position	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($) security position
Schedule of Held-to-maturity Securities [Line Items]
Available for sale debt securities, at fair value	$ 2,072,337,000		$ 2,057,851,000
Held to maturity debt securities, net (fair value of $417,664 and $449,709 at March 31, 2022 and December 31, 2021, respectively).	$ 421,958,000		$ 436,150,000
Total number of all held to maturity and available for sale securities in an unrealized loss position \| security	489		166
Investments which pay principal on periodic basis, amortized cost	$ 1,810,000,000
Investments which pay principal on periodic basis, fair value	1,720,000,000
Proceeds from sales of securities	$ 0	$ 9,400,000
Gain recognized on sale of securities		230,000
Loss recognized on sale of securities		0
Securities available for sale, number of securities in an unrealized loss position \| position	309		113
Debt Securities, available-for-sale, amortized cost	$ 2,188,704,000		$ 2,058,135,000
Unrealized loss	118,908,000		$ 17,903,000
Proceeds from sale of held-to-maturity securities	0	0
Held to maturity securities, proceeds from calls	15,800,000	6,800,000
Held to maturity securities, recognized gain on calls	16,000	0
Held to maturity securities, recognized loss on calls	$ 0	$ 33,000
Number of securities in an unrealized loss position \| security	180		53
Held-to-maturity, debt securities, allowance	$ 34,000		$ 39,000
AAA
Schedule of Held-to-maturity Securities [Line Items]
Amount of total portfolio	15.00%
AA
Schedule of Held-to-maturity Securities [Line Items]
Amount of total portfolio	73.00%
A
Schedule of Held-to-maturity Securities [Line Items]
Amount of total portfolio	11.00%
A rated or not rated
Schedule of Held-to-maturity Securities [Line Items]
Amount of total portfolio	1.00%
Private Label Mortgage-Backed Securities
Schedule of Held-to-maturity Securities [Line Items]
Securities available for sale, number of securities in an unrealized loss position \| position	3
Debt Securities, available-for-sale, amortized cost	$ 3,400,000
Unrealized loss	212,000,000
Mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Available for sale debt securities, at fair value	1,670,464,000		1,708,831,000
Debt Securities, available-for-sale, amortized cost	1,767,392,000		1,711,312,000
Unrealized loss	98,060,000		16,563,000
Mortgage-based securities, amortized cost	13,000
Mortgage-based securities, fair value	13,000
Held-to-maturity, debt securities, allowance	$ 34,000		$ 39,000

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