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Investment Securities - Carrying value and estimated fair value (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities
Debt Securities, Amortized Cost	$ 470,080
Available-for-sale investment securities, Amortized cost	470,080	$ 423,639
Available-for-sale investment securities	477,554	432,535
Available-for-sale Securities, Gross Unrealized Gains	9,406	10,243
Available-for-sale Securities, Gross Unrealized Losses	(1,932)	(1,347)
Held-to-maturity Securities, Debt Maturities [Abstract]
Amortized Cost	31,712	31,964
Estimated Fair Value	35,142	35,096
U.S. Government agencies
Schedule of Available-for-sale Securities
Debt Securities, Amortized Cost	52,803	33,088
Debt Securities, Estimated Fair Value	52,901	33,090
Available-for-sale Securities, Gross Unrealized Gains	315	245
Available-for-sale Securities, Gross Unrealized Losses	(217)	(243)
Obligations of states and political subdivisions
Schedule of Available-for-sale Securities
Debt Securities, Amortized Cost	181,785	143,343
Debt Securities, Estimated Fair Value	188,268	149,295
Available-for-sale Securities, Gross Unrealized Gains	6,779	6,266
Available-for-sale Securities, Gross Unrealized Losses	(296)	(314)
Held-to-maturity Securities, Debt Maturities [Abstract]
Amortized Cost	31,712	31,964
Gross Unrealized Gains	3,431	3,138
Gross Unrealized Losses	(1)	(6)
Estimated Fair Value	35,142	35,096
U.S. Government agencies collateralized by residential mortgage obligations
Schedule of Available-for-sale Securities
Debt Securities, Amortized Cost	225,636	236,629
Debt Securities, Estimated Fair Value	225,259	237,872
Available-for-sale Securities, Gross Unrealized Gains	1,042	2,033
Available-for-sale Securities, Gross Unrealized Losses	(1,419)	(790)
Private label residential mortgage backed securities
Schedule of Available-for-sale Securities
Debt Securities, Amortized Cost	2,356	3,079
Debt Securities, Estimated Fair Value	3,590	4,693
Available-for-sale Securities, Gross Unrealized Gains	1,234	1,614
Available-for-sale Securities, Gross Unrealized Losses	0	0
Other equity securities
Schedule of Available-for-sale Securities
Equity Securities, Amortized Cost	7,500	7,500
Equity Securities, Estimated Fair Value	7,536	7,585
Available-for-sale Securities, Gross Unrealized Gains	36	85
Available-for-sale Securities, Gross Unrealized Losses	$ 0	$ 0

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