Securities - Reconciliation of Available-for-Sale and Held-to-Maturity Securities in Continuous Unrealized Loss Position (Detail) $ in Thousands	Dec. 31, 2023 USD ($) security	Dec. 31, 2022 USD ($) security
Fair Value
Less than 12 Months	$ 5,561	$ 472,731
12 Months or Longer	927,745	565,777
Total	$ 933,306	$ 1,038,508
Number of Securities | security	407	439
Unrealized Losses
Less than 12 Months	$ 25	$ 33,764
12 Months or Longer	89,046	70,254
Total	89,071	104,018
Fair Value
Less than 12 Months	3,976	129,018
12 Months or Longer	679,756	617,633
Total	683,732	746,651
Unrealized Losses
Less than 12 Months	4	7,192
12 Months or Longer	133,942	155,731
Total	$ 133,946	$ 162,923
Number of Securities | security	542	581
U.S. Treasury and U.S. government agencies
Fair Value
Less than 12 Months	$ 2,587	$ 114,514
12 Months or Longer	308,315	229,094
Total	$ 310,902	$ 343,608
Number of Securities | security	59	67
Unrealized Losses
Less than 12 Months	$ 0	$ 5,856
12 Months or Longer	19,694	22,563
Total	19,694	28,419
Fair Value
Less than 12 Months	0	6,671
12 Months or Longer	8,956	2,412
Total	8,956	9,083
Unrealized Losses
Less than 12 Months	0	336
12 Months or Longer	499	389
Total	$ 499	$ 725
Number of Securities | security	3	3
Mortgage-backed securities, residential
Fair Value
Less than 12 Months	$ 10	$ 127,363
12 Months or Longer	284,803	182,079
Total	$ 284,813	$ 309,442
Number of Securities | security	129	135
Unrealized Losses
Less than 12 Months	$ 0	$ 12,399
12 Months or Longer	34,546	28,349
Total	34,546	40,748
Fair Value
Less than 12 Months	285	32,549
12 Months or Longer	274,528	264,035
Total	274,813	296,584
Unrealized Losses
Less than 12 Months	2	2,275
12 Months or Longer	52,163	55,853
Total	$ 52,165	$ 58,128
Number of Securities | security	183	182
Collateralized mortgage obligations, residential
Fair Value
Less than 12 Months	$ 0	$ 66,316
12 Months or Longer	137,070	87,742
Total	$ 137,070	$ 154,058
Number of Securities | security	100	104
Unrealized Losses
Less than 12 Months	$ 0	$ 3,958
12 Months or Longer	13,656	12,486
Total	13,656	16,444
Fair Value
Less than 12 Months	0	4,668
12 Months or Longer	9,447	5,787
Total	9,447	10,455
Unrealized Losses
Less than 12 Months	0	516
12 Months or Longer	2,796	2,054
Total	$ 2,796	$ 2,570
Number of Securities | security	11	12
Mortgage-backed securities, multifamily
Fair Value
Less than 12 Months	$ 0	$ 0
12 Months or Longer	676	786
Total	$ 676	$ 786
Number of Securities | security	1	1
Unrealized Losses
Less than 12 Months	$ 0	$ 0
12 Months or Longer	180	215
Total	180	215
Fair Value
Less than 12 Months	0
12 Months or Longer	3,494
Total	3,494
Unrealized Losses
Less than 12 Months	0
12 Months or Longer	651
Total	$ 651
Number of Securities | security	3
Collateralized mortgage obligations, multifamily
Fair Value
Less than 12 Months	$ 0	37,407
12 Months or Longer	42,496	8,926
Total	$ 42,496	$ 46,333
Number of Securities | security	20	20
Unrealized Losses
Less than 12 Months	$ 0	$ 2,861
12 Months or Longer	4,045	1,914
Total	4,045	4,775
Asset-backed securities
Fair Value
Less than 12 Months	2,694	34,871
12 Months or Longer	40,999	17,524
Total	$ 43,693	$ 52,395
Number of Securities | security	16	17
Unrealized Losses
Less than 12 Months	$ 25	$ 977
12 Months or Longer	843	733
Total	868	1,710
Obligations of states and political subdivisions
Fair Value
Less than 12 Months	270	3,771
12 Months or Longer	16,353	16,746
Total	$ 16,623	$ 20,517
Number of Securities | security	36	46
Unrealized Losses
Less than 12 Months	$ 0	$ 276
12 Months or Longer	571	713
Total	571	989
Fair Value
Less than 12 Months	3,691	82,459
12 Months or Longer	380,787	341,076
Total	384,478	423,535
Unrealized Losses
Less than 12 Months	2	3,689
12 Months or Longer	77,377	96,711
Total	$ 77,379	$ 100,400
Number of Securities | security	341	379
Corporate debt securities
Fair Value
Less than 12 Months	$ 0	$ 88,489
12 Months or Longer	97,033	22,880
Total	$ 97,033	$ 111,369
Number of Securities | security	46	49
Unrealized Losses
Less than 12 Months	$ 0	$ 7,437
12 Months or Longer	15,511	3,281
Total	15,511	10,718
Fair Value
Less than 12 Months	0	0
12 Months or Longer	2,544	2,647
Total	2,544	2,647
Unrealized Losses
Less than 12 Months	0	0
12 Months or Longer	456	353
Total	$ 456	$ 353
Number of Securities | security	1	1
Mortgage-backed securities, multifamily
Fair Value
Less than 12 Months		$ 2,671
12 Months or Longer		1,676
Total		4,347
Unrealized Losses
Less than 12 Months		376
12 Months or Longer		371
Total		$ 747
Number of Securities | security		4