Business Segment Information - Operating Statements (Details) - USD ($)	3 Months Ended						9 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Operating Income
Interest income	$ 61,438,000			$ 60,791,000			$ 178,066,000	$ 175,406,000
Total interest expense	21,523,000			15,419,000			58,603,000	34,483,000
Net interest income	39,915,000			45,372,000			119,463,000	140,923,000
Provision for (recapture of) credit losses on loans	153,000			168,000			808,000	460,000
Net interest income after provision	39,762,000			45,204,000			118,655,000	140,463,000
Noninterest income	2,240,000			2,216,000			6,563,000	7,056,000
Noninterest expense	27,555,000			25,171,000			83,279,000	75,563,000
Income before income taxes	14,447,000			22,249,000			41,939,000	71,956,000
Income tax expense	3,940,000			6,454,000			12,032,000	20,841,000
Net income	10,507,000	$ 9,234,000	$ 10,166,000	15,795,000	$ 16,403,000	$ 18,917,000	29,907,000	51,115,000
Total assets	5,551,596,000			5,403,307,000			5,551,596,000	5,403,307,000	$ 5,194,095,000
Loans, net of deferred fees	3,410,236,000			3,285,461,000			3,410,236,000	3,285,461,000	3,350,378,000
Goodwill	167,631,000			167,631,000			167,631,000	167,631,000	167,631,000
Banking
Operating Income
Interest income	59,294,000			58,016,000			170,170,000	164,783,000
Intersegment interest allocations	470,000			397,000			1,346,000	1,626,000
Total interest expense	21,523,000			15,419,000			58,603,000	34,483,000
Net interest income	38,241,000			42,994,000			112,913,000	131,926,000
Provision for (recapture of) credit losses on loans	186,000			254,000			556,000	807,000
Net interest income after provision	38,055,000			42,740,000			112,357,000	131,119,000
Noninterest income	1,982,000			2,044,000			6,030,000	6,743,000
Noninterest expense	25,808,000			23,588,000			78,438,000	70,645,000
Intersegment expense allocations	121,000			109,000			381,000	435,000
Income before income taxes	14,350,000			21,305,000			40,330,000	67,652,000
Income tax expense	3,911,000			6,175,000			11,556,000	19,572,000
Net income	10,439,000			15,130,000			28,774,000	48,080,000
Total assets	5,466,494,000			5,314,922,000			5,466,494,000	5,314,922,000
Loans, net of deferred fees	3,353,037,000			3,233,379,000			3,353,037,000	3,233,379,000
Goodwill	154,587,000			154,587,000			154,587,000	154,587,000	154,587,000
Factoring
Operating Income
Interest income	2,144,000			2,775,000			7,896,000	10,623,000
Intersegment interest allocations	(470,000)			(397,000)			(1,346,000)	(1,626,000)
Net interest income	1,674,000			2,378,000			6,550,000	8,997,000
Provision for (recapture of) credit losses on loans	(33,000)			(86,000)			252,000	(347,000)
Net interest income after provision	1,707,000			2,464,000			6,298,000	9,344,000
Noninterest income	258,000			172,000			533,000	313,000
Noninterest expense	1,747,000			1,583,000			4,841,000	4,918,000
Intersegment expense allocations	(121,000)			(109,000)			(381,000)	(435,000)
Income before income taxes	97,000			944,000			1,609,000	4,304,000
Income tax expense	29,000			279,000			476,000	1,269,000
Net income	68,000			665,000			1,133,000	3,035,000
Total assets	85,102,000			88,385,000			85,102,000	88,385,000
Loans, net of deferred fees	57,199,000			52,082,000			57,199,000	52,082,000
Goodwill	$ 13,044,000			$ 13,044,000			$ 13,044,000	$ 13,044,000	$ 13,044,000