Securities - Reconciliation of Available-for-Sale and Held-to-Maturity Securities in Continuous Unrealized Loss Position (Detail) $ in Thousands	Dec. 31, 2021 USD ($) security	Dec. 31, 2020 USD ($) security
Fair Value
Less than 12 Months	$ 378,941	$ 174,022
12 Months or Longer	38,045	23,308
Total	$ 416,986	$ 197,330
Number of Securities | security	94	61
Unrealized Losses
Less than 12 Months	$ 3,508	$ 977
12 Months or Longer	923	353
Total	4,431	1,330
Fair Value
Less than 12 Months	650,352	2,561
12 Months or Longer	2,376	0
Total	652,728	2,561
Unrealized Losses
Less than 12 Months	11,684	12
12 Months or Longer	107	0
Total	$ 11,791	$ 12
Number of Securities | security	336	4
U.S. Treasury and U.S. government agencies
Fair Value
Less than 12 Months	$ 76,106	$ 4,966
12 Months or Longer	14,670	17,652
Total	$ 90,776	$ 22,618
Number of Securities | security	15	6
Unrealized Losses
Less than 12 Months	$ 322	$ 29
12 Months or Longer	467	284
Total	789	313
Mortgage-backed securities, residential
Fair Value
Less than 12 Months	176,990	84,137
12 Months or Longer	14,582	5,656
Total	$ 191,572	$ 89,793
Number of Securities | security	45	30
Unrealized Losses
Less than 12 Months	$ 1,465	$ 471
12 Months or Longer	266	69
Total	1,731	540
Fair Value
Less than 12 Months	340,474	2,561
12 Months or Longer	2,376	0
Total	342,850	2,561
Unrealized Losses
Less than 12 Months	5,882	12
12 Months or Longer	107	0
Total	$ 5,989	$ 12
Number of Securities | security	96	4
Collateralized mortgage obligations, residential
Fair Value
Less than 12 Months	$ 86,749	$ 23,858
12 Months or Longer	5,000	0
Total	$ 91,749	$ 23,858
Number of Securities | security	18	7
Unrealized Losses
Less than 12 Months	$ 1,429	$ 22
12 Months or Longer	59	0
Total	1,488	22
Mortgage-backed securities, multifamily
Fair Value
Less than 12 Months	0	1,943
12 Months or Longer	1,741	0
Total	$ 1,741	$ 1,943
Number of Securities | security	1	1
Unrealized Losses
Less than 12 Months	$ 0	$ 0
12 Months or Longer	75	0
Total	75	0
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
Collateralized mortgage obligations, multifamily
Fair Value
Less than 12 Months	$ 9,083	2,527
12 Months or Longer	1,072	0
Total	$ 10,155	$ 2,527
Number of Securities | security	4	1
Unrealized Losses
Less than 12 Months	$ 210	$ 2
12 Months or Longer	36	0
Total	246	2
Asset-backed securities
Fair Value
Less than 12 Months	14,688	40,690
12 Months or Longer	0	0
Total	$ 14,688	$ 40,690
Number of Securities | security	3	6
Unrealized Losses
Less than 12 Months	$ 87	$ 225
12 Months or Longer	0	0
Total	87	225
Debt securities
Fair Value
Less than 12 Months	15,325
12 Months or Longer	980
Total	$ 16,305
Number of Securities | security	8
Unrealized Losses
Less than 12 Months	$ (5)
12 Months or Longer	20
Total	15
Obligations of states and political subdivisions
Fair Value
Less than 12 Months		15,901
12 Months or Longer		0
Total		$ 15,901
Number of Securities | security		10
Unrealized Losses
Less than 12 Months		$ 228
12 Months or Longer		0
Total		$ 228
Fair Value
Less than 12 Months	307,827
12 Months or Longer	0
Total	307,827
Unrealized Losses
Less than 12 Months	5,800
12 Months or Longer	0
Total	$ 5,800
Number of Securities | security	239