Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Interest Income
Loans, including fees	$ 86,425	$ 85,830	$ 81,159
Investment securities - Taxable	7,798	5,576	4,670
Investment securities -Exempt from federal income taxes	949	798	1,234
Other	930	1,096	639
Total interest income	96,102	93,300	87,702
Interest Expense
Deposits	8,843	13,334	6,991
Short-term borrowings		1,805	1,896
Long-term debt	3,413	3,610	3,591
Total interest expense	12,256	18,749	12,478
Net interest income	83,846	74,551	75,224
Provision for loan losses	10,900	7,312	8,610
Net interest income after provision for loan losses	72,946	67,239	66,614
Noninterest Income
Mortgage banking	61,641	25,805	17,630
Net gains (losses) on investment securities	2,737	357	85
Other	5,177	6,947	5,010
Total noninterest income	149,371	114,194	102,749
Noninterest Expense
Compensation	89,206	74,018	69,403
Employee taxes and benefits	20,050	19,456	17,866
Occupancy and equipment expense	11,073	10,751	11,086
Business services, software and technology expense	19,124	16,381	14,525
Intangible amortization expense	3,961	4,081	4,638
Professional fees and assessments	4,700	4,011	5,098
Marketing and business development	3,133	3,162	3,459
Supplies and postage	2,169	2,722	2,737
Travel	359	1,787	1,738
Mortgage and lending expenses	5,039	2,853	2,153
Other	4,985	3,315	3,622
Total noninterest expense	163,799	142,537	136,325
Income before income taxes	58,518	38,896	33,038
Income tax expense	13,843	9,356	7,172
Net income	$ 44,675	$ 29,540	$ 25,866
Per Common Share Data
Basic earnings per common share	$ 2.57	$ 1.96	$ 1.88
Diluted earnings per common share	2.52	1.91	1.84
Dividends declared per common share	$ 0.60	$ 0.57	$ 0.53
Average common shares outstanding	17,106	14,736	13,763
Diluted average common shares outstanding	17,438	15,093	14,063
Retirement and Benefit Services
Noninterest Income
Revenue	$ 60,956	$ 63,811	$ 63,316
Wealth Management
Noninterest Income
Revenue	17,451	15,502	14,900
Deposit Account
Noninterest Income
Revenue	$ 1,409	$ 1,772	$ 1,808