Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Interest income:
Interest and fees on loans	$ 35,580	$ 36,522	$ 104,651	$ 107,235
Interest and dividends on taxable investment securities	2,786	5,891	12,310	17,670
Interest on tax-exempt investment securities	614	690	1,903	1,956
Other interest income	33	506	317	945
Total interest income	39,013	43,609	119,181	127,806
Interest expense:
Interest on deposits	2,669	6,159	10,582	16,722
Interest on short-term borrowings	742	1,150	2,355	3,556
Interest on long-term borrowings	483	546	1,629	1,811
Total interest expense	3,894	7,855	14,566	22,089
Net interest income	35,119	35,754	104,615	105,717
Provision for credit losses (a)	4,728	1,005	33,531	1,368
Net interest income after provision for credit losses	30,391	34,749	71,084	104,349
Non-interest income:
Insurance income	3,608	3,386	10,929	11,493
Mortgage banking income	2,658	1,204	4,346	2,992
Bank owned life insurance income	462	487	1,514	1,462
Net gain on investment securities	2	97	383	70
Net loss on asset disposals and other transactions	(28)	(78)	(237)	(553)
Other non-interest income	534	510	1,393	2,113
Total non-interest income	16,770	16,393	47,171	47,111
Non-interest expense:
Salaries and employee benefit costs	19,410	18,931	57,313	58,957
Net occupancy and equipment expense	3,383	3,098	9,688	9,208
Electronic banking expense	2,095	2,070	5,839	5,340
Data processing and software expense	1,838	1,572	5,344	4,684
Professional fees	1,720	1,544	5,247	5,164
Amortization of other intangible assets	857	953	2,314	2,471
Franchise tax expense	882	797	2,645	2,274
Marketing expense	456	634	1,561	1,718
Foreclosed real estate and other loan expenses	342	600	1,255	1,324
Communication expense	283	268	857	863
FDIC insurance premium	570	0	717	752
Other non-interest expense	2,479	2,526	7,665	10,974
Total non-interest expense	34,315	32,993	100,445	103,729
Income before income taxes	12,846	18,149	17,810	47,731
Income tax expense	2,636	3,281	3,616	8,896
Net income	$ 10,210	$ 14,868	$ 14,194	$ 38,835
Earnings per common share - basic	$ 0.52	$ 0.72	$ 0.70	$ 1.93
Earnings per common share - diluted	$ 0.51	$ 0.72	$ 0.70	$ 1.91
Weighted-average number of common shares outstanding - basic	19,504,503	20,415,245	19,862,409	20,023,271
Weighted-average number of common shares outstanding - diluted	19,637,689	20,595,769	19,998,353	20,178,634
Cash dividends declared	$ 6,770	$ 7,040	$ 20,622	$ 19,943
Cash dividends declared per common share	$ 0.34	$ 0.34	$ 1.02	$ 0.98
Credit and Debit Card [Member]
Non-interest income:
Revenue from Contract with Customer, Including Assessed Tax	$ 3,765	$ 3,577	$ 10,568	$ 9,831
Deposit Account [Member]
Non-interest income:
Revenue from Contract with Customer, Including Assessed Tax	2,266	3,233	6,995	8,551
Fiduciary and Trust [Member]
Non-interest income:
Revenue from Contract with Customer, Including Assessed Tax	3,435	3,205	10,013	9,718
Interest Rate Swap [Member] | Transaction fee [Member]
Non-interest income:
Revenue from Contract with Customer, Including Assessed Tax	$ 68	$ 772	$ 1,267	$ 1,434