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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
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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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