Business Segment Information - Operating Statements (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating Income
Interest income	$ 188,828,000	$ 153,256,000	$ 150,471,000
Total interest expense	8,948,000	7,131,000	8,581,000
Net interest income	179,880,000	146,125,000	141,890,000
Provision for (recapture of) credit losses on loans	766,000	(3,134,000)	13,233,000
Net interest income after provision	179,114,000	149,259,000	128,657,000
Noninterest income	10,111,000	9,688,000	9,922,000
Noninterest expense	94,859,000	93,077,000	89,511,000
Income before income taxes	94,366,000	65,870,000	49,068,000
Income tax expense	27,811,000	18,170,000	13,769,000
Net income	66,555,000	47,700,000	35,299,000
Total assets	5,157,580,000	5,499,409,000	4,634,114,000
Loans, net of deferred fees	3,298,550,000	3,087,326,000	2,619,261,000
Goodwill	167,631,000	167,631,000	167,631,000
Noninterest expense includes merger-related costs		27,000	2,601,000
Banking
Operating Income
Interest income	176,010,000	141,772,000	139,744,000
Intersegment interest allocations	1,441,000	868,000	923,000
Total interest expense	8,948,000	7,131,000	8,581,000
Net interest income	168,503,000	135,509,000	132,086,000
Provision for (recapture of) credit losses on loans	526,000	(2,926,000)	12,928,000
Net interest income after provision	167,977,000	138,435,000	119,158,000
Noninterest income	9,722,000	8,651,000	9,277,000
Noninterest expense	88,531,000	87,466,000	83,149,000
Intersegment expense allocations	524,000	410,000	404,000
Income before income taxes	89,692,000	60,030,000	45,690,000
Income tax expense	26,429,000	16,444,000	12,770,000
Net income	63,263,000	43,586,000	32,920,000
Total assets	5,062,943,000	5,424,350,000	4,567,239,000
Loans, net of deferred fees	3,219,287,000	3,034,097,000	2,572,060,000
Goodwill	154,587,000	154,587,000	154,587,000
Noninterest expense includes merger-related costs			2,601,000
Factoring
Operating Income
Interest income	12,818,000	11,484,000	10,727,000
Intersegment interest allocations	(1,441,000)	(868,000)	(923,000)
Net interest income	11,377,000	10,616,000	9,804,000
Provision for (recapture of) credit losses on loans	240,000	(208,000)	305,000
Net interest income after provision	11,137,000	10,824,000	9,499,000
Noninterest income	389,000	1,037,000	645,000
Noninterest expense	6,328,000	5,611,000	9,362,000
Intersegment expense allocations	(524,000)	(410,000)	(404,000)
Income before income taxes	4,674,000	5,840,000	3,378,000
Income tax expense	1,382,000	1,726,000	999,000
Net income	3,292,000	4,114,000	2,379,000
Total assets	94,637,000	75,059,000	66,875,000
Loans, net of deferred fees	79,263,000	53,229,000	47,201,000
Goodwill	13,044,000	13,044,000	13,044,000
Parent Company
Operating Income
Total interest expense	2,179,000	2,314,000	2,321,000
Income tax expense	(1,707,000)	(1,816,000)	(1,628,000)
Net income	66,555,000	47,700,000	$ 35,299,000
Total assets	$ 672,068,000	$ 638,280,000