Fair Value Measurements (Fair Value, by Balance Sheet Grouping) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated fair value	$ 296,139		$ 319,882
Investment Securities held-to-maturity, estimated fair value (in dollars)	148,043		155,555
MSRs	2,211	$ 2,276	2,248	$ 2,288	$ 2,239	$ 2,232
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated fair value	0		0
Interest rate swap derivatives	0		0
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated fair value	296,139		319,882
Interest rate swap derivatives	9,753		4,828
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated fair value	0		0
Interest rate swap derivatives	0		0
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	125,103		83,089
Estimated fair value	296,139		319,882
Investment Securities held-to-maturity, estimated fair value (in dollars)	143,793		152,579
FHLB stock	3,012		25,646
Loans held-for-sale	2,824		6,690
Loans, net	1,619,238		1,468,784
BOLI	54,185		53,449
MSRs	2,211		2,248
Interest rate swap derivatives	9,753		4,828
Deposits	2,082,995		1,981,622
Interest rate swap derivatives	9,753		4,828
Fair Value | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	125,103		83,089
Fair Value | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated fair value	296,139		319,882
Investment Securities held-to-maturity, estimated fair value (in dollars)	148,043		155,555
FHLB stock	3,012		25,646
Loans held-for-sale	2,824		6,690
Interest rate swap derivatives	9,753		4,828
Deposits	2,082,991		1,981,994
Interest rate swap derivatives	9,753		4,828
Fair Value | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans, net	1,622,911		1,471,327
BOLI	54,185		53,449
MSRs	$ 2,954		$ 2,773