Consolidated Statements of Income - USD ($) shares in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Interest income:
Interest and fees on loans	$ 143,520,000	$ 149,873,000	$ 130,703,000
Interest and dividends on investment securities	17,464,000	18,532,000	21,601,000
Other interest income	315,000	395,000	428,000
Total interest income	161,299,000	168,800,000	152,732,000
Interest expense:
Deposits	17,822,000	28,494,000	19,055,000
Short-term borrowings	1,604,000	7,923,000	8,342,000
Long-term borrowings	2,888,000	2,471,000	2,471,000
Total interest expense	22,314,000	38,888,000	29,868,000
Net interest income	138,985,000	129,912,000	122,864,000
Provision for credit losses	27,184,000	8,044,000	8,934,000
Net interest income after provision for credit losses	111,801,000	121,868,000	113,930,000
Noninterest income:
Service charges on deposits	4,810,000	7,241,000	7,120,000
Insurance income	4,403,000	4,570,000	4,930,000
ATM and debit card	7,281,000	6,779,000	6,152,000
Investment advisory	9,535,000	9,187,000	8,123,000
Company owned life insurance	1,902,000	1,758,000	1,793,000
Investments in limited partnerships	104,000	352,000	1,203,000
Loan servicing	249,000	432,000	441,000
Income from derivative instruments, net	5,521,000	2,274,000	972,000
Net gain on sale of loans held for sale	3,858,000	1,352,000	796,000
Net gain (loss) on investment securities	1,599,000	1,677,000	(127,000)
Net (loss) gain on other assets	(61,000)	29,000	50,000
Net loss on tax credit investments	(275,000)	(528,000)
Other	4,250,000	5,258,000	5,025,000
Total noninterest income	43,176,000	40,381,000	36,478,000
Noninterest expense:
Salaries and employee benefits	59,336,000	56,330,000	54,643,000
Occupancy and equipment	13,655,000	13,552,000	12,892,000
Professional services	6,326,000	5,424,000	3,912,000
Computer and data processing	11,645,000	9,983,000	9,568,000
Supplies and postage	1,975,000	2,036,000	2,032,000
FDIC assessments	2,242,000	1,005,000	1,975,000
Advertising and promotions	2,609,000	3,577,000	3,582,000
Amortization of intangibles	1,134,000	1,250,000	1,257,000
Goodwill impairment		0	2,350,000
Restructuring charges	1,492,000
Other	8,840,000	9,671,000	8,665,000
Total noninterest expense	109,254,000	102,828,000	100,876,000
Income before income taxes	45,723,000	59,421,000	49,532,000
Income tax expense	7,391,000	10,559,000	10,006,000
Net income	38,332,000	48,862,000	39,526,000
Preferred stock dividends	1,461,000	1,461,000	1,461,000
Net income available to common shareholders	$ 36,871,000	$ 47,401,000	$ 38,065,000
Earnings per common share (Note 20):
Basic	$ 2.30	$ 2.97	$ 2.39
Diluted	2.30	2.96	2.39
Cash dividends declared per common share	$ 1.04	$ 1.00	$ 0.96
Weighted average common shares outstanding:
Basic	16,022	15,972	15,910
Diluted	16,063	16,031	15,956