Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Goodwill and other intangibles	$ 51,866		$ 51,866		$ 42,645
Total assets	2,879,589		2,879,589		2,449,158
Net interest income	23,921	$ 20,491	46,223	$ 40,456
Provision for loan losses	2,400	750	3,500	1,300
Service fees, security gains and other noninterest income	9,136	7,129	17,006	13,772
Noninterest expense	16,950	16,120	34,936	31,511
Amortization and depreciation expense	790	719	1,541	1,428
INCOME BEFORE INCOME TAXES	12,917	10,031	23,252	19,989
Income taxes	1,906	1,488	3,602	3,058
NET INCOME	11,011	8,543	19,650	16,931
Eliminations And Others
Segment Reporting Information [Line Items]
Goodwill and other intangibles	(3,558)		(3,558)		(822)
Total assets	(1,113)		(1,113)		4,482
Net interest income	(100)	(23)	(184)	(45)
Provision for loan losses	0	0	0	0
Service fees, security gains and other noninterest income	(134)	(87)	(282)	(128)
Noninterest expense	138	274	571	413
Amortization and depreciation expense	68	12	116	24
INCOME BEFORE INCOME TAXES	(440)	(396)	(1,153)	(610)
Income taxes	(149)	(138)	(356)	(250)
NET INCOME	(291)	(258)	(797)	(360)
Trust Segment | Operating Segments
Segment Reporting Information [Line Items]
Goodwill and other intangibles	6,186		6,186		6,326
Total assets	16,389		16,389		13,892
Net interest income	30	40	64	78
Provision for loan losses	0	0	0	0
Service fees, security gains and other noninterest income	2,322	2,292	4,565	4,548
Noninterest expense	1,512	1,520	3,029	3,121
Amortization and depreciation expense	77	92	153	184
INCOME BEFORE INCOME TAXES	763	720	1,447	1,321
Income taxes	160	152	304	278
NET INCOME	603	568	1,143	1,043
Bank Segment | Operating Segments
Segment Reporting Information [Line Items]
Goodwill and other intangibles	49,238		49,238		37,141
Total assets	2,864,313		2,864,313		$ 2,430,784
Net interest income	23,991	20,474	46,343	40,423
Provision for loan losses	2,400	750	3,500	1,300
Service fees, security gains and other noninterest income	6,948	4,924	12,723	9,352
Noninterest expense	15,300	14,326	31,336	27,977
Amortization and depreciation expense	645	615	1,272	1,220
INCOME BEFORE INCOME TAXES	12,594	9,707	22,958	19,278
Income taxes	1,895	1,474	3,654	3,030
NET INCOME	$ 10,699	$ 8,233	$ 19,304	$ 16,248