Securities (Reconciliation of fair value of securities) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Reconciliation of fair value of securities
Available for sale Securities, Amortized Cost	$ 348,506	$ 360,317
Available for Sale Securities Gross Gain unrealized	7,451	7,675
Available for sale Securities, Unrealized Losses Other	(6,205)	(8,801)
Available for sale Securities, Other Than Temporary Impairment	(1,494)	(2,329)
Available for sale Securities, Fair Value, Total	348,258	356,862
Held to maturity Securities, Amortized Cost	375,556	350,652
Held to Maturity Securities Holding Gain Unrecognized	4,443	3,012
Held to Maturity Securities Holding Loss Unrecognized	(5,469)	(7,209)
Held to maturity Securities, Other Than Temporary Impairment
Held to Maturity, Fair Value, Total	374,530	346,455
Amortized Cost	724,062	710,969
Gross Unrealized Gains	11,894	10,687
Unrealized Losses Other	(11,674)	(16,010)
Other Than Temporary Impairment	(1,494)	(2,329)
Fair Value	722,788	703,317
U. S. Government Agency Securities [Member]
Reconciliation of fair value of securities
Available for sale Securities, Amortized Cost	41,335	41,331
Available for Sale Securities Gross Gain unrealized	4	3
Available for sale Securities, Unrealized Losses Other	(415)	(885)
Available for sale Securities, Other Than Temporary Impairment
Available for sale Securities, Fair Value, Total	40,924	40,449
U.S. Treasury Securities [Member]
Reconciliation of fair value of securities
Held to maturity Securities, Amortized Cost	1,011	1,011
Held to Maturity Securities Holding Gain Unrecognized	42	31
Held to Maturity Securities Holding Loss Unrecognized	0
Held to maturity Securities, Other Than Temporary Impairment
Held to Maturity, Fair Value, Total	1,053	1,042
Agency Mortgage-Backed Securities [Member]
Reconciliation of fair value of securities
Available for sale Securities, Amortized Cost	223,304	232,742
Available for Sale Securities Gross Gain unrealized	6,339	6,405
Available for sale Securities, Unrealized Losses Other	(2,878)	(4,556)
Available for sale Securities, Other Than Temporary Impairment
Available for sale Securities, Fair Value, Total	226,765	234,591
Held to maturity Securities, Amortized Cost	175,069	155,067
Held to Maturity Securities Holding Gain Unrecognized	2,523	1,917
Held to Maturity Securities Holding Loss Unrecognized	(255)	(1,033)
Held to maturity Securities, Other Than Temporary Impairment
Held to Maturity, Fair Value, Total	177,337	155,951
Agency Collateralized Mortgage Obligations [Member]
Reconciliation of fair value of securities
Available for sale Securities, Amortized Cost	56,277	58,765
Available for Sale Securities Gross Gain unrealized	259	490
Available for sale Securities, Unrealized Losses Other	(1,081)	(1,102)
Available for sale Securities, Other Than Temporary Impairment
Available for sale Securities, Fair Value, Total	55,455	58,153
Held to maturity Securities, Amortized Cost	192,293	187,388
Held to Maturity Securities Holding Gain Unrecognized	1,627	824
Held to Maturity Securities Holding Loss Unrecognized	(5,214)	(6,176)
Held to maturity Securities, Other Than Temporary Impairment
Held to Maturity, Fair Value, Total	188,706	182,036
State, County, and Municipal Securities [Member]
Reconciliation of fair value of securities
Available for sale Securities, Amortized Cost	5,415	5,439
Available for Sale Securities Gross Gain unrealized	36	1
Available for sale Securities, Unrealized Losses Other	(1)	(28)
Available for sale Securities, Other Than Temporary Impairment
Available for sale Securities, Fair Value, Total	5,450	5,412
Held to maturity Securities, Amortized Cost	678	678
Held to Maturity Securities Holding Gain Unrecognized	11	7
Held to Maturity Securities Holding Loss Unrecognized	0
Held to maturity Securities, Other Than Temporary Impairment
Held to Maturity, Fair Value, Total	689	685
Single Issuer Trust Preferred Securities Issued by Banks and Insurers [Member]
Reconciliation of fair value of securities
Available for sale Securities, Amortized Cost	2,949	2,960
Available for Sale Securities Gross Gain unrealized	68	14
Available for sale Securities, Unrealized Losses Other		(22)
Available for sale Securities, Other Than Temporary Impairment
Available for sale Securities, Fair Value, Total	3,017	2,952
Held to maturity Securities, Amortized Cost	1,501	1,503
Held to Maturity Securities Holding Gain Unrecognized	25	23
Held to Maturity Securities Holding Loss Unrecognized	0
Held to maturity Securities, Other Than Temporary Impairment
Held to Maturity, Fair Value, Total	1,526	1,526
Pooled Trust Preferred Securities Issued by Banks and Insurers [Member]
Reconciliation of fair value of securities
Available for sale Securities, Amortized Cost	8,044	8,083
Available for Sale Securities Gross Gain unrealized
Available for sale Securities, Unrealized Losses Other	(1,583)	(1,913)
Available for sale Securities, Other Than Temporary Impairment	(1,494)	(2,329)
Available for sale Securities, Fair Value, Total	4,967	3,841
Marketable Equity Securities [Member]
Reconciliation of fair value of securities
Available for sale Securities, Amortized Cost	11,182	10,997
Available for Sale Securities Gross Gain unrealized	745	762
Available for sale Securities, Unrealized Losses Other	(247)	(295)
Available for sale Securities, Other Than Temporary Impairment
Available for sale Securities, Fair Value, Total	11,680	11,464
Corporate Debt Securities [Member]
Reconciliation of fair value of securities
Held to maturity Securities, Amortized Cost	5,004	5,005
Held to Maturity Securities Holding Gain Unrecognized	215	210
Held to Maturity Securities Holding Loss Unrecognized	0
Held to maturity Securities, Other Than Temporary Impairment
Held to Maturity, Fair Value, Total	$ 5,219	$ 5,215