Business Segment Information - Operating Statements (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating Income
Interest income	$ 234,298,000	$ 188,828,000	$ 153,256,000
Total interest expense	51,074,000	8,948,000	7,131,000
Net interest income	183,224,000	179,880,000	146,125,000
Provision for (recapture of) credit losses on loans	749,000	766,000	(3,134,000)
Net interest income after provision	182,475,000	179,114,000	149,259,000
Noninterest income	8,998,000	10,111,000	9,688,000
Noninterest expense	101,054,000	94,859,000	93,077,000
Income before income taxes	90,419,000	94,366,000	65,870,000
Income tax expense	25,976,000	27,811,000	18,170,000
Net income	64,443,000	66,555,000	47,700,000
Total assets	5,194,095,000	5,157,580,000	5,499,409,000
Loans, net of deferred fees	3,350,378,000	3,298,550,000	3,087,326,000
Goodwill	167,631,000	167,631,000	167,631,000
Banking
Operating Income
Interest income	220,871,000	176,010,000	141,772,000
Intersegment interest allocations	2,038,000	1,441,000	868,000
Total interest expense	51,074,000	8,948,000	7,131,000
Net interest income	171,835,000	168,503,000	135,509,000
Provision for (recapture of) credit losses on loans	1,005,000	526,000	(2,926,000)
Net interest income after provision	170,830,000	167,977,000	138,435,000
Noninterest income	8,582,000	9,722,000	8,651,000
Noninterest expense	94,451,000	88,531,000	87,466,000
Intersegment expense allocations	547,000	524,000	410,000
Income before income taxes	85,508,000	89,692,000	60,030,000
Income tax expense	24,524,000	26,429,000	16,444,000
Net income	60,984,000	63,263,000	43,586,000
Total assets	5,111,367,000	5,062,943,000	5,424,350,000
Loans, net of deferred fees	3,292,920,000	3,219,287,000	3,034,097,000
Goodwill	154,587,000	154,587,000	154,587,000
Factoring
Operating Income
Interest income	13,427,000	12,818,000	11,484,000
Intersegment interest allocations	(2,038,000)	(1,441,000)	(868,000)
Net interest income	11,389,000	11,377,000	10,616,000
Provision for (recapture of) credit losses on loans	(256,000)	240,000	(208,000)
Net interest income after provision	11,645,000	11,137,000	10,824,000
Noninterest income	416,000	389,000	1,037,000
Noninterest expense	6,603,000	6,328,000	5,611,000
Intersegment expense allocations	(547,000)	(524,000)	(410,000)
Income before income taxes	4,911,000	4,674,000	5,840,000
Income tax expense	1,452,000	1,382,000	1,726,000
Net income	3,459,000	3,292,000	4,114,000
Total assets	82,728,000	94,637,000	75,059,000
Loans, net of deferred fees	57,458,000	79,263,000	53,229,000
Goodwill	$ 13,044,000	$ 13,044,000	$ 13,044,000