Consolidated Statements of Income - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest income
Loans, including fees	$ 109,049,000	$ 104,106,000	$ 80,824,000
Securities, taxable	6,842,000	5,918,000	6,417,000
Securities, tax-exempt	2,165,000	2,089,000	1,643,000
Other interest-earning assets	401,000	215,000	234,000
Total interest income	118,457,000	112,328,000	89,118,000
Interest expense
Deposits	7,549,000	7,590,000	8,378,000
Short-term borrowings	211,000	157,000	122,000
Federal Home Loan Bank advances	2,263,000	765,000	636,000
Subordinated debentures and other borrowings	2,567,000	2,642,000	2,204,000
Total interest expense	12,590,000	11,154,000	11,340,000
Net interest income	105,867,000	101,174,000	77,778,000
Provision for loan losses	2,900,000	(1,000,000)	(3,000,000)
Net interest income after provision for loan losses	102,967,000	102,174,000	80,778,000
Noninterest income
Service charges on deposit and sweep accounts	4,253,000	3,308,000	2,586,000
Credit and debit card fees	4,278,000	4,329,000	2,494,000
Mortgage banking activities	3,866,000	3,619,000	1,672,000
Earnings on bank owned life insurance	1,264,000	1,113,000	1,184,000
Payroll processing	1,016,000	969,000	782,000
Letter of credit fees	493,000	457,000	335,000
Gain on trust preferred securities repurchase	2,970,000	0	0
Other income	2,898,000	2,243,000	975,000
Total noninterest income	21,038,000	16,038,000	10,028,000
Noninterest expense
Salaries and benefits	43,524,000	42,594,000	33,703,000
Occupancy	6,063,000	5,976,000	4,637,000
Furniture and equipment rent, depreciation and maintenance	2,119,000	2,332,000	1,738,000
Data processing	7,939,000	7,696,000	5,869,000
Advertising	1,586,000	1,363,000	1,315,000
FDIC insurance costs	1,236,000	1,717,000	1,182,000
Problem asset costs	338,000	1,212,000	585,000
Efficiency program-related costs	172,000	765,000	0
Merger-related costs	0	0	5,447,000
Other expense	14,141,000	15,726,000	11,134,000
Total noninterest expenses	77,118,000	79,381,000	65,610,000
Income before federal income tax expense	46,887,000	38,831,000	25,196,000
Federal income tax expense	14,974,000	11,811,000	7,865,000
Net income	$ 31,913,000	$ 27,020,000	$ 17,331,000
Earnings per common share:
Basic (in dollars per share)	$ 1.96	$ 1.63	$ 1.28
Diluted (in dollars per share)	$ 1.96	$ 1.62	$ 1.28