Segment Reporting - Schedule of Segment Reporting (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) segment	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Segment Reporting [Abstract]
Reportable business segments | segment			3
Segment Reporting Information [Line Items]
Total assets	$ 6,979,852,000	$ 6,382,831,000	$ 6,979,852,000	$ 6,382,831,000	$ 6,336,496,000
Interest income	53,571,000	50,612,000	157,469,000	152,611,000
Interest expense	4,884,000	6,758,000	16,611,000	22,771,000
Net interest income	48,687,000	43,854,000	140,858,000	129,840,000
Provision (reversal of provision) for credit losses	(182,000)	3,935,000	(11,524,000)	49,515,000
Noninterest income	20,552,000	21,805,000	64,032,000	58,189,000
Noninterest Expense	43,248,000	38,527,000	124,074,000	113,264,000
Intersegment (revenues) expense	0	0	0	0
Income before income taxes	26,173,000	23,197,000	92,340,000	25,250,000
Income tax expense	5,262,000	5,078,000	17,951,000	4,208,000
Net income	20,911,000	18,119,000	74,389,000	21,042,000
Net capital expenditures	455,000	683,000	3,241,000	2,363,000
Banking1
Segment Reporting Information [Line Items]
Total assets	6,868,525,000	6,277,894,000	6,868,525,000	6,277,894,000	6,234,336,000
Interest income	53,562,000	50,603,000	157,443,000	152,578,000
Interest expense	3,556,000	4,867,000	10,789,000	18,399,000
Net interest income	50,006,000	45,736,000	146,654,000	134,179,000
Provision (reversal of provision) for credit losses	(182,000)	3,935,000	(11,524,000)	49,515,000
Noninterest income	9,548,000	11,919,000	30,211,000	27,755,000
Noninterest Expense	34,378,000	31,304,000	97,977,000	91,097,000
Intersegment (revenues) expense	(323,000)	(296,000)	(969,000)	(852,000)
Income before income taxes	25,681,000	22,712,000	91,381,000	22,174,000
Income tax expense	5,196,000	4,367,000	18,373,000	2,944,000
Net income	20,485,000	18,345,000	73,008,000	19,230,000
Net capital expenditures	431,000	646,000	3,121,000	2,291,000
Wealth Management [Member]
Segment Reporting Information [Line Items]
Total assets	51,280,000	47,550,000	51,280,000	47,550,000	48,646,000
Interest income	0	1,000	1,000	8,000
Interest expense	0	0	0	0
Net interest income	0	1,000	1,000	8,000
Provision (reversal of provision) for credit losses	0	0	0	0
Noninterest income	6,963,000	5,963,000	20,492,000	17,654,000
Noninterest Expense	4,922,000	3,845,000	13,499,000	11,752,000
Intersegment (revenues) expense	164,000	168,000	492,000	466,000
Income before income taxes	1,877,000	1,951,000	6,502,000	5,444,000
Income tax expense	391,000	396,000	1,347,000	1,109,000
Net income	1,486,000	1,555,000	5,155,000	4,335,000
Net capital expenditures	4,000	15,000	16,000	21,000
Insurance [Member]
Segment Reporting Information [Line Items]
Total assets	38,118,000	35,168,000	38,118,000	35,168,000	35,906,000
Interest income	0	0	0	0
Interest expense	0	0	0	0
Net interest income	0	0	0	0
Provision (reversal of provision) for credit losses	0	0	0	0
Noninterest income	3,988,000	3,924,000	13,083,000	13,020,000
Noninterest Expense	3,232,000	2,974,000	9,686,000	9,095,000
Intersegment (revenues) expense	159,000	128,000	477,000	386,000
Income before income taxes	597,000	822,000	2,920,000	3,539,000
Income tax expense	123,000	171,000	613,000	749,000
Net income	474,000	651,000	2,307,000	2,790,000
Net capital expenditures	5,000	14,000	18,000	23,000
Other Segments [Member]
Segment Reporting Information [Line Items]
Total assets	21,929,000	22,219,000	21,929,000	22,219,000	$ 17,608,000
Interest income	9,000	8,000	25,000	25,000
Interest expense	1,328,000	1,891,000	5,822,000	4,372,000
Net interest income	(1,319,000)	(1,883,000)	(5,797,000)	(4,347,000)
Provision (reversal of provision) for credit losses	0	0	0	0
Noninterest income	53,000	(1,000)	246,000	(240,000)
Noninterest Expense	716,000	404,000	2,912,000	1,320,000
Intersegment (revenues) expense	0	0	0	0
Income before income taxes	(1,982,000)	(2,288,000)	(8,463,000)	(5,907,000)
Income tax expense	(448,000)	144,000	(2,382,000)	(594,000)
Net income	(1,534,000)	(2,432,000)	(6,081,000)	(5,313,000)
Net capital expenditures	$ 15,000	$ 8,000	$ 86,000	$ 28,000