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Investment securities - Amortized Cost and Fair Value of Investment Securities Aggregated by Investment Category (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Amortized Cost	$ 294,385	$ 333,294
Available-for-sale, Gross Unrealized Gains	5,909	6,817
Available-for-sale, Gross Unrealized Losses	462	525
Available-for-sale, Fair Value	299,832	339,586
Total Amortized Cost, Held to maturity	13,107	14,665
Held-to-maturity, Gross Unrealized Gains	525	588
Held-to-maturity, Gross Unrealized Losses	50	38
Held-to-maturity, Fair Value	13,582	15,215
Mortgage-Backed Securities, U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Amortized Cost	34,027	37,511
Available-for-sale, Gross Unrealized Gains	198	132
Available-for-sale, Gross Unrealized Losses	31	167
Available-for-sale, Fair Value	34,194	37,476
Total Amortized Cost, Held to maturity	88	100
Held-to-maturity, Gross Unrealized Gains	1	2
Held-to-maturity, Fair Value	89	102
Mortgage-Backed Securities, U.S. Government-Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Amortized Cost	36,282	46,956
Available-for-sale, Gross Unrealized Gains	235	277
Available-for-sale, Gross Unrealized Losses	109	226
Available-for-sale, Fair Value	36,408	47,007
Total Amortized Cost, Held to maturity	5,650	7,195
Held-to-maturity, Gross Unrealized Gains	399	481
Held-to-maturity, Fair Value	6,049	7,676
U.S. Government-Sponsored Enterprises State and Municipals [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Amortized Cost	79,077	95,990
Available-for-sale, Gross Unrealized Gains	547	337
Available-for-sale, Gross Unrealized Losses	1	82
Available-for-sale, Fair Value	79,623	96,245
U.S. Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Amortized Cost	15,915	48,393
Available-for-sale, Gross Unrealized Gains	152	157
Available-for-sale, Fair Value	16,067	48,550
State and Municipals, Taxable [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Amortized Cost	15,886	16,490
Available-for-sale, Gross Unrealized Gains	864	943
Available-for-sale, Gross Unrealized Losses	19	26
Available-for-sale, Fair Value	16,731	17,407
State and Municipals, Tax-Exempt [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Amortized Cost	113,198	87,954
Available-for-sale, Gross Unrealized Gains	3,913	4,971
Available-for-sale, Gross Unrealized Losses	302	24
Available-for-sale, Fair Value	116,809	92,901
Total Amortized Cost, Held to maturity	7,369	7,370
Held-to-maturity, Gross Unrealized Gains	125	105
Held-to-maturity, Gross Unrealized Losses	50	38
Held-to-maturity, Fair Value	$ 7,444	$ 7,437

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