Revenue Recognition - Summary of Company's Source of Non-interest Income (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Non-interest income
Increase in bank-owned life insurance	$ 736	$ 676	$ 1,601	$ 1,277
Net gain on acquisition and branch sales	540	663	540	585
Net gain (loss) from securities transactions	(32)		8	17
Other non-interest income
Total non-interest income	9,637	9,100	18,659	15,812
Service Charges and Fees [Member]
Non-interest income
Non-interest income	2,617	2,169	5,139	3,765
Other non-interest income
Non-interest income	2,617	2,169	5,139	3,765
Debit Card Income [Member]
Non-interest income
Non-interest income	2,810	2,679	5,438	5,029
Other non-interest income
Non-interest income	2,810	2,679	5,438	5,029
Mortgage Banking [Member]
Non-interest income
Non-interest income	428	848	990	1,783
Other non-interest income
Non-interest income	428	848	990	1,783
Accounting Standards Update 2014-09 [Member]
Non-interest income
Increase in bank-owned life insurance	736	676	1,601	1,277
Net gain on acquisition and branch sales	540	663	540	585
Net gain (loss) from securities transactions	(32)		8	17
Other non-interest income
Recovery on zero-basis purchased loans	13	19	33	53
Income (loss) from equity method investments	(56)	(56)	(111)	(111)
Other non-interest income not related to loans and deposits	17	45	24	47
Total other non-interest income	2,538	2,065	4,943	3,356
Total non-interest income	9,637	9,100	18,659	15,812
Accounting Standards Update 2014-09 [Member] | Service Charges and Fees [Member]
Non-interest income
Non-interest income	2,617	2,169	5,139	3,765
Other non-interest income
Non-interest income	2,617	2,169	5,139	3,765
Accounting Standards Update 2014-09 [Member] | Debit Card Income [Member]
Non-interest income
Non-interest income	2,810	2,679	5,438	5,029
Other non-interest income
Non-interest income	2,810	2,679	5,438	5,029
Accounting Standards Update 2014-09 [Member] | Mortgage Banking [Member]
Non-interest income
Non-interest income	428	848	990	1,783
Accounting Standards Update 2014-09 [Member] | Investment Referral Income [Member]
Non-interest income
Non-interest income	140	194	283	317
Other non-interest income
Non-interest income	140	194	283	317
Accounting Standards Update 2014-09 [Member] | Trust Income [Member]
Non-interest income
Non-interest income	264	336	557	496
Other non-interest income
Non-interest income	264	336	557	496
Accounting Standards Update 2014-09 [Member] | Insurance Sales Commissions [Member]
Non-interest income
Non-interest income	47	46	113	106
Other non-interest income
Non-interest income	47	46	113	106
Accounting Standards Update 2014-09 [Member] | Other Non Interest Income Related To Loans and Deposits [Member]
Non-interest income
Non-interest income	2,113	1,481	4,044	2,448
Other non-interest income
Non-interest income	$ 2,113	$ 1,481	$ 4,044	$ 2,448