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Investment Securities - Carrying value and estimated fair value (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities
Available-for-sale investment securities, Amortized cost	$ 447,108	$ 381,074
Gross Unrealized Gains	5,145	14,612
Gross Unrealized Losses	(9,029)	(1,721)
Equity Securities, Estimated Fair Value	7,514	7,948
Available-for-sale Securities	443,224	393,965
U.S. Government agencies
Schedule of Available-for-sale Securities
Debt Securities, Amortized Cost	18,172	9,443
Gross Unrealized Gains	115	34
Gross Unrealized Losses	(84)	(23)
Debt Securities, Estimated Fair Value	18,203	9,454
Obligations of states and political subdivisions
Schedule of Available-for-sale Securities
Debt Securities, Amortized Cost	162,018	151,312
Gross Unrealized Gains	2,906	10,751
Gross Unrealized Losses	(6,517)	(385)
Debt Securities, Estimated Fair Value	158,407	161,678
U.S. Government agencies collateralized by residential mortgage obligations
Schedule of Available-for-sale Securities
Debt Securities, Amortized Cost	254,978	206,465
Gross Unrealized Gains	1,075	3,152
Gross Unrealized Losses	(2,344)	(1,107)
Debt Securities, Estimated Fair Value	253,709	208,510
Private label residential mortgage backed securities
Schedule of Available-for-sale Securities
Debt Securities, Amortized Cost	4,344	6,258
Gross Unrealized Gains	1,047	323
Gross Unrealized Losses	0	(206)
Debt Securities, Estimated Fair Value	5,391	6,375
Other equity securities
Schedule of Available-for-sale Securities
Equity Securities, Amortized Cost	7,596	7,596
Gross Unrealized Gains	2	352
Gross Unrealized Losses	$ (84)	$ 0

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