Parent Company Financial Information, Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statements of Cash Flows [Abstract]
Net income	$ 6,921	$ 5,870	$ 5,384
Adjustments to reconcile net income to net cash provided by operating activities [Abstract]
Stock plan accruals	230	185	157
Net cash provided by operating activities	13,551	10,442	16,220
Cash flows from financing activities [Abstract]
Dividend on preferred stock	(105)	(129)	(677)
Common stock issued	82	84	76
Stock options exercised	84	0	0
Net cash provided by financing activities	78,270	53,214	62,371
Net (decrease) increase in cash and cash equivalents	(15,395)	50,745	15,824
Cash and cash equivalents at beginning of year	216,192	165,447	149,623
Cash and cash equivalents at end of year	200,797	216,192	165,447
Parent Company [Member]
Statements of Cash Flows [Abstract]
Net income	6,921	5,870	5,384
Adjustments to reconcile net income to net cash provided by operating activities [Abstract]
Stock plan accruals	230	185	157
Decrease in other liabilities	(32)	(112)	(141)
Equity in undistributed earnings of subsidiary	3,989	(5,946)	4,549
Net cash provided by operating activities	11,108	(3)	9,949
Cash flows from financing activities [Abstract]
Redemption of preferred stock	(12,847)	0	(10,000)
Dividend on preferred stock	(105)	(129)	(677)
Common stock issued	82	84	76
Stock options exercised	84	0	0
Cash in lieu of fractional shares	(6)	(6)	(4)
Net cash provided by financing activities	(12,792)	(51)	(10,605)
Net (decrease) increase in cash and cash equivalents	(1,684)	(54)	(656)
Cash and cash equivalents at beginning of year	3,928	3,982	4,638
Cash and cash equivalents at end of year	$ 2,244	$ 3,928	$ 3,982