Consolidated Statements of Operations - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Interest income:
Interest and fees on loans	$ 31,250,000	$ 25,464,000	$ 58,131,000	$ 49,763,000
Interest and dividends on taxable investment securities	5,830,000	4,956,000	11,480,000	9,665,000
Interest on tax-exempt investment securities	635,000	762,000	1,278,000	1,556,000
Other interest income	54,000	26,000	106,000	41,000
Total interest income	37,769,000	31,208,000	70,995,000	61,025,000
Interest expense:
Interest on deposits	3,101,000	1,729,000	5,314,000	3,216,000
Interest on short-term borrowings	1,175,000	233,000	2,143,000	484,000
Interest on long-term borrowings	685,000	1,156,000	1,371,000	2,290,000
Total interest expense	4,961,000	3,118,000	8,828,000	5,990,000
Net interest income	32,808,000	28,090,000	62,167,000	55,035,000
Provision for loan losses	1,188,000	947,000	3,171,000	1,571,000
Net interest income after provision for loan losses	31,620,000	27,143,000	58,996,000	53,464,000
Non-interest income:
Insurance income	3,369,000	3,414,000	8,024,000	7,516,000
Trust and investment income	3,232,000	2,977,000	6,300,000	5,659,000
Electronic banking income	2,785,000	2,587,000	5,570,000	5,148,000
Deposit account service charges	2,388,000	2,294,000	4,508,000	4,723,000
Mortgage banking income	969,000	467,000	1,320,000	854,000
Bank owned life insurance income	497,000	496,000	965,000	989,000
Commercial loan swap fees	146,000	651,000	262,000	919,000
Net (loss) gain on asset disposals and other transactions	(405,000)	109,000	(331,000)	106,000
Net (loss) gain on investment securities	(147,000)	18,000	(146,000)	358,000
Other non-interest income (a)	421,000	704,000	1,752,000	1,116,000
Total non-interest income	13,255,000	13,717,000	28,224,000	27,388,000
Non-interest expense:
Salaries and employee benefit costs	18,025,000	15,049,000	34,015,000	30,545,000
Professional fees	3,022,000	1,529,000	4,740,000	3,139,000
Net occupancy and equipment expense	2,803,000	2,648,000	5,669,000	5,361,000
Electronic banking expense	1,448,000	1,525,000	2,976,000	3,039,000
Data processing and software expense	1,359,000	1,096,000	2,681,000	2,238,000
Amortization of other intangible assets	861,000	871,000	1,615,000	1,734,000
Marketing expense	656,000	354,000	981,000	634,000
Franchise tax expense	614,000	584,000	1,258,000	1,167,000
FDIC insurance expense	416,000	457,000	782,000	890,000
Foreclosed real estate and other loan expenses	338,000	179,000	550,000	375,000
Communication expense	300,000	390,000	644,000	800,000
Other non-interest expense	6,129,000	1,998,000	8,281,000	4,089,000
Total non-interest expense	35,971,000	26,680,000	64,192,000	54,011,000
Income before income taxes	8,904,000	14,180,000	23,028,000	26,841,000
Income tax expense	1,012,000	4,414,000	3,395,000	8,266,000
Net income	$ 7,892,000	$ 9,766,000	$ 19,633,000	$ 18,575,000
Earnings per common share - basic	$ 0.41	$ 0.54	$ 1.05	$ 1.02
Earnings per common share - diluted	$ 0.41	$ 0.53	$ 1.04	$ 1.02
Weighted-average number of common shares outstanding - basic	19,160,728	18,044,574	18,646,266	18,037,333
Weighted-average number of common shares outstanding - diluted	19,293,381	18,203,752	18,773,169	18,195,715
Cash dividends declared	$ 5,466,000	$ 3,645,000	$ 10,237,000	$ 7,279,000
Cash dividends declared per common share	$ 0.28	$ 0.2000	$ 0.54	$ 0.4
Unrealized Gain (Loss) on Marketable Securities, Cost Method Investments, and Other Investments	$ 236,000		$ 224,000