Consolidated Statements of Cash Flows - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash Flows from Operating Activities:
Net income		$ 21,742	$ 20,040	$ 16,891
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	[1]	850	750	(850)
Net amortization and accretion		3,892	3,767	4,832
(Gain) loss on disposition of premises and equipment		6	(1,069)	9
Realized investment securities gains (losses), net		47	223	0
Stock-based compensation		1,166	633	378
Gain on sale of loans held for sale		(14)	(1,247)	(1,083)
Proceeds from sales of loans held for sale		840	63,314	94,676
Originations of loans held for sale		0	(60,663)	(92,460)
(Gain) loss on sale of other real estate owned		8	2	(111)
Write-down of other real estate owned		0	1,786	1,341
Increase in value of bank-owned life insurance		(727)	(731)	(646)
Depreciation		921	853	786
Deferred income taxes		82	535	1,147
Excess tax benefits from vesting of restricted stock units		(155)	(116)	(16)
Change in assets and liabilities:
(Increase) decrease in accrued interest receivable		(263)	(418)	(355)
(Increase) decrease in other assets		2,937	(450)	580
Increase (decrease) in accrued expenses and other liabilities		(196)	(476)	(1,728)
Net cash provided by operating activities		31,042	26,287	23,391
Cash Flows from Investing Activities:
Proceeds from sales of securities available for sale		16,946	36,582	0
Proceeds from maturities and calls of securities available for sale		49,665	56,450	74,202
Purchases of securities available for sale		(116,824)	(67,770)	(143,384)
Purchases of Federal Home Loan Bank stock		(19,986)	(29,064)	(7,537)
Proceeds from redemption of Federal Home Loan Bank stock		22,614	25,840	7,475
Net increase in loans		(62,133)	(193,585)	(65,436)
Proceeds from sales of other real estate owned		2,227	2,103	1,744
Proceeds from sales of premises and equipment		0	3,013	0
Purchases of premises and equipment		(2,502)	(5,298)	(2,199)
Purchase of bank-owned life insurance		0	(5,000)	0
Proceeds from settlement of other assets		3,593	0	0
Net cash provided by (used in) investing activities		(106,400)	(176,729)	(135,135)
Cash Flows from Financing Activities:
Net increase in deposits		170,267	106,620	29,266
Net (decrease) in federal funds purchased		(215)	(13,647)	(38,974)
Net increase (decrease) in other short-term borrowings		(47,000)	66,000	0
Proceeds from long-term debt		0	0	16,000
Principal payments on long-term debt		(4,261)	(3,260)	(830)
Interest rate swap termination costs paid		(541)	0	0
Common stock dividends paid		(9,952)	(7,842)	(6,995)
Repurchase and cancellation of common stock		0	0	(15,774)
Restricted stock units withheld for payroll taxes		(225)	(189)	(14)
Excess tax benefits from vesting of restricted stock units		155	116	16
Net cash provided by (used in) financing activities		108,228	147,798	(17,305)
Net increase (decrease) in cash and cash equivalents		32,870	(2,644)	(129,049)
Cash and Cash Equivalents:
Beginning		39,781	42,425	171,474
Ending		72,651	39,781	42,425
Supplemental Disclosure of Cash Flow Information:
Interest		6,069	6,166	7,101
Income taxes		6,700	7,045	6,755
Supplemental Disclosure of Noncash Investing and Financing Activities:
Transfer of loans to other real estate owned		0	394	179
Transfer of investment securities available for sale to investment securities held to maturity		0	50,882	0
Transfer of investment securities to other assets, sale not settled		0	3,593	0
Purchases of premises financed by issuance of long-term debt		$ 0	$ 0	$ 765

[1] The negative provisions for the various segments are either related to the decline in outstanding balances in each of those portfolio segments during the time periods disclosed and/or improvement in the credit quality factors related to those portfolio segments.