Securities (Reconciliation of fair value of securities) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Reconciliation of fair value of securities
Available for sale Securities, Amortized Cost	$ 359,419	$ 343,093
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	8,073	8,832
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(1,700)	(3,371)
Available-for-sale Securities	365,792	348,554
Held to maturity Securities, Amortized Cost	448,139	375,453
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	9,320	7,747
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	(1,683)	(3,501)
Held to Maturity, Fair Value, Total	455,776	379,699
Amortized Cost	807,558	718,546
Gross Unrealized Gains	17,393	16,579
Unrealized Losses Other	(3,383)	(6,872)
Fair Value	821,568	728,253
U. S. Government Agency Securities [Member]
Reconciliation of fair value of securities
Available for sale Securities, Amortized Cost	36,895	41,369
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	692	139
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	0	(22)
Available-for-sale Securities	37,587	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	75	63
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	0	0
Held to Maturity, Fair Value, Total	1,084	1,073
Agency mortgage-backed securities
Reconciliation of fair value of securities
Available for sale Securities, Amortized Cost	206,778	211,168
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	6,247	7,203
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(104)	(693)
Available-for-sale Securities	212,921	217,678
Held to maturity Securities, Amortized Cost	172,684	159,522
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	5,718	5,422
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	0	0
Held to Maturity, Fair Value, Total	178,402	164,944
Agency Collateralized Mortgage Obligations [Member]
Reconciliation of fair value of securities
Available for sale Securities, Amortized Cost	51,868	63,059
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	611	599
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(404)	(623)
Available-for-sale Securities	52,075	63,035
Held to maturity Securities, Amortized Cost	230,820	198,220
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	2,769	1,842
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	(1,679)	(3,478)
Held to Maturity, Fair Value, Total	231,910	196,584
State, County, and Municipal Securities [Member]
Reconciliation of fair value of securities
Available for sale Securities, Amortized Cost	4,557	5,106
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	114	117
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Available-for-sale Securities	4,671	5,223
Held to maturity Securities, Amortized Cost	225	424
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	4	4
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	0	0
Held to Maturity, Fair Value, Total	229	428
Single Issuer Trust Preferred Securities Issued by Banks and Insurers [Member]
Reconciliation of fair value of securities
Available for sale Securities, Amortized Cost	2,877	2,913
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	9	12
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(45)	(16)
Available-for-sale Securities	2,841	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	(4)	(23)
Held to Maturity, Fair Value, Total	1,496	1,477
Pooled trust preferred securities issued by banks and insurers
Reconciliation of fair value of securities
Available for sale Securities, Amortized Cost	2,226	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	(640)	(1,780)
Available-for-sale Securities	1,586	6,321
Small Business Administration Pooled Securities [Member]
Reconciliation of fair value of securities
Available for sale Securities, Amortized Cost	41,018	0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	155	0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(17)	0
Available-for-sale Securities	41,156	0
Held to maturity Securities, Amortized Cost	36,901	9,775
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	712	299
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	0	0
Held to Maturity, Fair Value, Total	37,613	10,074
Equity securities
Reconciliation of fair value of securities
Available for sale Securities, Amortized Cost	13,200	11,572
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	245	567
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(490)	(237)
Available-for-sale Securities	12,955	11,902
Corporate debt securities
Reconciliation of fair value of securities
Held to maturity Securities, Amortized Cost	5,000	5,002
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	42	117
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	0	0
Held to Maturity, Fair Value, Total	$ 5,042	$ 5,119