Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Segment Reporting Information [Line Items]
Goodwill and other intangibles	$ 48,670		$ 48,670		$ 49,617
Total assets	3,317,047		3,317,047		3,071,148
Net interest income	26,534	$ 24,165	78,291	$ 70,388
Provision for credit losses and unfunded loans	(948)	2,600	(473)	6,100
Service fees, security gains and other noninterest income	9,015	9,217	28,706	25,662
Noninterest expense	16,300	16,682	49,136	51,069
Amortization and depreciation expense	828	788	2,430	2,317
INCOME BEFORE INCOME TAXES	19,369	13,312	55,904	36,564
Income taxes	3,358	2,443	9,762	6,045
NET INCOME	16,011	10,869	46,142	30,519
Eliminations And Others
Segment Reporting Information [Line Items]
Goodwill and other intangibles	(3,558)		(3,558)		(3,558)
Total assets	3,328		3,328		373
Net interest income	(295)	(63)	(400)	(247)
Provision for credit losses and unfunded loans	0	0	0	0
Service fees, security gains and other noninterest income	(77)	(64)	(128)	(346)
Noninterest expense	(12)	63	(409)	634
Amortization and depreciation expense	108	68	244	184
INCOME BEFORE INCOME TAXES	(468)	(258)	(363)	(1,411)
Income taxes	(150)	(120)	(286)	(476)
NET INCOME	(318)	(138)	(77)	(935)
Trust Segment | Operating Segments
Segment Reporting Information [Line Items]
Goodwill and other intangibles	5,872		5,872		6,046
Total assets	14,732		14,732		15,147
Net interest income	31	31	94	95
Provision for credit losses and unfunded loans	0	0	0	0
Service fees, security gains and other noninterest income	2,707	2,357	8,108	6,922
Noninterest expense	1,726	1,507	4,818	4,549
Amortization and depreciation expense	67	88	194	228
INCOME BEFORE INCOME TAXES	945	793	3,190	2,240
Income taxes	198	166	669	470
NET INCOME	747	627	2,521	1,770
Bank Segment | Operating Segments
Segment Reporting Information [Line Items]
Goodwill and other intangibles	46,356		46,356		47,129
Total assets	3,298,987		3,298,987		$ 3,055,628
Net interest income	26,798	24,197	78,597	70,540
Provision for credit losses and unfunded loans	(948)	2,600	(473)	6,100
Service fees, security gains and other noninterest income	6,385	6,924	20,726	19,086
Noninterest expense	14,586	15,112	44,727	45,886
Amortization and depreciation expense	653	632	1,992	1,905
INCOME BEFORE INCOME TAXES	18,892	12,777	53,077	35,735
Income taxes	3,310	2,397	9,379	6,051
NET INCOME	$ 15,582	$ 10,380	$ 43,698	$ 29,684