Securities (Reconciliation of fair value of securities) (Details) - Fair Value Hierarchy [Domain] - Fair Value, Measurement Frequency [Domain] - Fair Value, Option, Eligible Item or Group [Domain] - Asset Class [Domain] - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Reconciliation of fair value of securities
Available for sale Securities, Amortized Cost	$ 370,593	$ 343,093
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	6,951	8,832
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(2,543)	(3,371)
Available-for-sale Securities	375,001	348,554
Held to maturity Securities, Amortized Cost	428,339	375,453
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	6,365	7,747
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	(2,926)	(3,501)
Held to Maturity, Fair Value, Total	431,778	379,699
Amortized Cost	798,932	718,546
Gross Unrealized Gains	13,316	16,579
Unrealized Losses Other	(5,469)	(6,872)
Fair Value	806,779	728,253
U. S. Government Agency Securities [Member]
Reconciliation of fair value of securities
Available for sale Securities, Amortized Cost	39,375	41,369
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	351	139
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	0	(22)
Available-for-sale Securities	39,726	41,486
U.S. Treasury securities
Reconciliation of fair value of securities
Held to maturity Securities, Amortized Cost	1,009	1,010
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	61	63
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	0	0
Held to Maturity, Fair Value, Total	1,070	1,073
Agency mortgage-backed securities
Reconciliation of fair value of securities
Available for sale Securities, Amortized Cost	226,438	211,168
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	5,436	7,203
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(877)	(693)
Available-for-sale Securities	230,997	217,678
Held to maturity Securities, Amortized Cost	158,432	159,522
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	4,011	5,422
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	(69)	0
Held to Maturity, Fair Value, Total	162,374	164,944
Agency Collateralized Mortgage Obligations [Member]
Reconciliation of fair value of securities
Available for sale Securities, Amortized Cost	55,241	63,059
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	477	599
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(516)	(623)
Available-for-sale Securities	55,202	63,035
Held to maturity Securities, Amortized Cost	224,994	198,220
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	1,885	1,842
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	(2,754)	(3,478)
Held to Maturity, Fair Value, Total	224,125	196,584
State, County, and Municipal Securities [Member]
Reconciliation of fair value of securities
Available for sale Securities, Amortized Cost	4,571	5,106
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	97	117
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Available-for-sale Securities	4,668	5,223
Held to maturity Securities, Amortized Cost	225	424
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	2	4
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	0	0
Held to Maturity, Fair Value, Total	227	428
Single Issuer Trust Preferred Securities Issued by Banks and Insurers [Member]
Reconciliation of fair value of securities
Available for sale Securities, Amortized Cost	2,889	2,913
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	11	12
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(28)	(16)
Available-for-sale Securities	2,872	2,909
Held to maturity Securities, Amortized Cost	1,500	1,500
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	0	0
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	0	(23)
Held to Maturity, Fair Value, Total	1,500	1,477
Pooled trust preferred securities issued by banks and insurers
Reconciliation of fair value of securities
Available for sale Securities, Amortized Cost	2,246	7,906
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	0	195
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(651)	(1,780)
Available-for-sale Securities	1,595	6,321
Small Business Administration Pooled Securities [Member]
Reconciliation of fair value of securities
Available for sale Securities, Amortized Cost	26,632	0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax		0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(135)	0
Available-for-sale Securities	26,497	0
Held to maturity Securities, Amortized Cost	37,178	9,775
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	341	299
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	(103)	0
Held to Maturity, Fair Value, Total	37,416	10,074
Equity securities
Reconciliation of fair value of securities
Available for sale Securities, Amortized Cost	13,201	11,572
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	579	567
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(336)	(237)
Available-for-sale Securities	13,444	11,902
Corporate debt securities
Reconciliation of fair value of securities
Held to maturity Securities, Amortized Cost	5,001	5,002
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	65	117
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	0	0
Held to Maturity, Fair Value, Total	$ 5,066	$ 5,119