Securities - Reconciliation of Available-for-Sale and Held-to-Maturity Securities in Continuous Unrealized Loss Position (Detail) $ in Thousands	Dec. 31, 2022 USD ($) security	Dec. 31, 2021 USD ($) security
Fair Value
Less than 12 Months	$ 472,731	$ 378,941
12 Months or Longer	565,777	38,045
Total	$ 1,038,508	$ 416,986
Number of Securities | security	439	94
Unrealized Losses
Less than 12 Months	$ 33,764	$ 3,508
12 Months or Longer	70,254	923
Total	104,018	4,431
Fair Value
Less than 12 Months	129,018	650,352
12 Months or Longer	617,633	2,376
Total	746,651	652,728
Unrealized Losses
Less than 12 Months	7,192	11,684
12 Months or Longer	155,731	107
Total	$ 162,923	$ 11,791
Number of Securities | security	581	336
U.S. Treasury and U.S. government agencies
Fair Value
Less than 12 Months	$ 114,514	$ 76,106
12 Months or Longer	229,094	14,670
Total	$ 343,608	$ 90,776
Number of Securities | security	67	15
Unrealized Losses
Less than 12 Months	$ 5,856	$ 322
12 Months or Longer	22,563	467
Total	28,419	789
Fair Value
Less than 12 Months	6,671
12 Months or Longer	2,412
Total	9,083
Unrealized Losses
Less than 12 Months	336
12 Months or Longer	389
Total	$ 725
Number of Securities | security	3
Mortgage-backed securities, residential
Fair Value
Less than 12 Months	$ 127,363	176,990
12 Months or Longer	182,079	14,582
Total	$ 309,442	$ 191,572
Number of Securities | security	135	45
Unrealized Losses
Less than 12 Months	$ 12,399	$ 1,465
12 Months or Longer	28,349	266
Total	40,748	1,731
Fair Value
Less than 12 Months	32,549	340,474
12 Months or Longer	264,035	2,376
Total	296,584	342,850
Unrealized Losses
Less than 12 Months	2,275	5,882
12 Months or Longer	55,853	107
Total	$ 58,128	$ 5,989
Number of Securities | security	182	96
Collateralized mortgage obligations, residential
Fair Value
Less than 12 Months	$ 66,316	$ 86,749
12 Months or Longer	87,742	5,000
Total	$ 154,058	$ 91,749
Number of Securities | security	104	18
Unrealized Losses
Less than 12 Months	$ 3,958	$ 1,429
12 Months or Longer	12,486	59
Total	16,444	1,488
Fair Value
Less than 12 Months	4,668
12 Months or Longer	5,787
Total	10,455
Unrealized Losses
Less than 12 Months	516
12 Months or Longer	2,054
Total	$ 2,570
Number of Securities | security	12
Mortgage-backed securities, multifamily
Fair Value
Less than 12 Months	$ 0	0
12 Months or Longer	786	1,741
Total	$ 786	$ 1,741
Number of Securities | security	1	1
Unrealized Losses
Less than 12 Months	$ 0	$ 0
12 Months or Longer	215	75
Total	215	75
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
Collateralized mortgage obligations, multifamily
Fair Value
Less than 12 Months	$ 37,407	9,083
12 Months or Longer	8,926	1,072
Total	$ 46,333	$ 10,155
Number of Securities | security	20	4
Unrealized Losses
Less than 12 Months	$ 2,861	$ 210
12 Months or Longer	1,914	36
Total	4,775	246
Asset-backed securities
Fair Value
Less than 12 Months	34,871	14,688
12 Months or Longer	17,524	0
Total	$ 52,395	$ 14,688
Number of Securities | security	17	3
Unrealized Losses
Less than 12 Months	$ 977	$ 87
12 Months or Longer	733	0
Total	1,710	87
Obligations of states and political subdivisions
Fair Value
Less than 12 Months	3,771
12 Months or Longer	16,746
Total	$ 20,517
Number of Securities | security	46
Unrealized Losses
Less than 12 Months	$ 276
12 Months or Longer	713
Total	989
Fair Value
Less than 12 Months	82,459	307,827
12 Months or Longer	341,076	0
Total	423,535	307,827
Unrealized Losses
Less than 12 Months	3,689	5,800
12 Months or Longer	96,711	0
Total	$ 100,400	$ 5,800
Number of Securities | security	379	239
Corporate debt securities
Fair Value
Less than 12 Months	$ 88,489	$ 15,325
12 Months or Longer	22,880	980
Total	$ 111,369	$ 16,305
Number of Securities | security	49	8
Unrealized Losses
Less than 12 Months	$ 7,437	$ (5)
12 Months or Longer	3,281	20
Total	10,718	15
Fair Value
Less than 12 Months	0
12 Months or Longer	2,647
Total	2,647
Unrealized Losses
Less than 12 Months	0
12 Months or Longer	353
Total	$ 353
Number of Securities | security	1
Mortgage-backed securities, multifamily
Fair Value
Less than 12 Months		2,051
12 Months or Longer		0
Total		2,051
Unrealized Losses
Less than 12 Months		2
12 Months or Longer		0
Total		$ 2
Number of Securities | security		1