Industry Segment Information (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) segment	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment			2
Interest Income (Expense), after Provision for Loan Loss [Abstract]
Fee income	$ 31,784,000	$ 27,577,000	$ 92,865,000	$ 80,739,000
Interest income	17,164,000	12,187,000	44,153,000	34,920,000
Interest expense	782,000	287,000	1,344,000	915,000
Intersegment income (expense)	15,971,000	11,432,000	41,515,000	32,588,000
Tax-equivalized pre-tax income	11,296,000	8,446,000	33,036,000	26,596,000
Goodwill	17,309,000	14,262,000	17,309,000	14,262,000	$ 14,262,000
Other intangible assets, net	4,321,000	2,779,000	4,321,000	2,779,000
Total assets	2,610,815,000	2,292,986,000	2,610,815,000	2,292,986,000	$ 2,554,901,000
Average funding sources	2,089,022,000	1,850,088,000	2,046,037,000	1,768,616,000
Tax equivalent adjustment	412,000	468,000	1,294,000	1,417,000
Corporate, Eliminations and Other
Interest Income (Expense), after Provision for Loan Loss [Abstract]
Fee income	555,000	338,000	1,689,000	1,175,000
Interest income	1,273,000	(361,000)	1,500,000	(1,335,000)
Interest expense	0	0	0	0
Intersegment income (expense)	(1,124,000)	(859,000)	(3,549,000)	(2,170,000)
Tax-equivalized pre-tax income	1,565,000	(193,000)	2,359,000	(654,000)
Goodwill	0	0	0	0
Other intangible assets, net	0	0	0	0
Total assets	(184,103,000)	(5,176,000)	(184,103,000)	(5,176,000)
Average funding sources	0	0	0	0
Information services payment and processing revenue | Operating Segments
Interest Income (Expense), after Provision for Loan Loss [Abstract]
Fee income	30,418,000	26,174,000	89,329,000	77,863,000
Interest income	7,158,000	7,108,000	20,175,000	18,501,000
Interest expense	0	0	0	0
Intersegment income (expense)	0	0	0	0
Tax-equivalized pre-tax income	5,605,000	6,509,000	20,259,000	18,477,000
Goodwill	17,173,000	14,126,000	17,173,000	14,126,000
Other intangible assets, net	4,321,000	2,779,000	4,321,000	2,779,000
Total assets	1,196,399,000	1,018,710,000	1,196,399,000	1,018,710,000
Average funding sources	1,139,568,000	974,091,000	1,082,449,000	906,474,000
Banking Services | Operating Segments
Interest Income (Expense), after Provision for Loan Loss [Abstract]
Fee income	811,000	1,065,000	1,847,000	1,701,000
Interest income	8,733,000	5,440,000	22,478,000	17,754,000
Interest expense	782,000	287,000	1,344,000	915,000
Intersegment income (expense)	1,124,000	859,000	3,549,000	2,170,000
Tax-equivalized pre-tax income	4,126,000	2,130,000	10,418,000	8,773,000
Goodwill	136,000	136,000	136,000	136,000
Other intangible assets, net	0	0	0	0
Total assets	1,598,519,000	1,279,452,000	1,598,519,000	1,279,452,000
Average funding sources	$ 949,454,000	$ 875,997,000	$ 963,588,000	$ 862,142,000