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Investment securities - Amortized Cost and Fair Value of Investment Securities Aggregated by Investment Category (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Amortized Cost | $ 280,342 |
Available for sale, Gross Unrealized Gains | 5,133 |
Available for sale, Gross Unrealized Losses | 540 |
Available for sale, Fair Value | 284,935 | $ 339,586
Total Amortized Cost, Held to maturity | 12,109 | 14,665
Held to maturity, Gross Unrealized Gains | 513 | 588
Held to maturity, Gross Unrealized Losses | 16 | 38
Held to maturity, Fair Value | 12,606 | 15,215
State and Municipals Tax Exempt Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total Amortized Cost, Held to maturity | 6,865 |
Held to maturity, Gross Unrealized Gains | 186 |
Held to maturity, Gross Unrealized Losses | 16 |
Held to maturity, Fair Value | 7,035 |
Mortgage-Backed Securities, U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Amortized Cost | 31,612 | 37,511
Available for sale, Gross Unrealized Gains | 73 | 132
Available for sale, Gross Unrealized Losses | 117 | 167
Available for sale, Fair Value | 31,568 | 37,476
Total Amortized Cost, Held to maturity | 84 | 100
Held to maturity, Gross Unrealized Gains | 1 | 2
Held to maturity, Fair Value | 85 | 102
Mortgage-Backed Securities, U.S. Government-Sponsored Enterprises [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Amortized Cost | 32,928 | 46,956
Available for sale, Gross Unrealized Gains | 119 | 277
Available for sale, Gross Unrealized Losses | 208 | 226
Available for sale, Fair Value | 32,839 | 47,007
Total Amortized Cost, Held to maturity | 5,160 | 7,195
Held to maturity, Gross Unrealized Gains | 326 | 481
Held to maturity, Fair Value | 5,486 | 7,676
U.S. Treasuries [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Amortized Cost | 10,030 | 48,393
Available for sale, Gross Unrealized Gains |  | 157
Available for sale, Gross Unrealized Losses | 31 |
Available for sale, Fair Value | 9,999 | 48,550
U.S. Government-Sponsored Enterprises State and Municipals [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Amortized Cost | 68,831 | 95,990
Available for sale, Gross Unrealized Gains | 291 | 337
Available for sale, Gross Unrealized Losses | 62 | 82
Available for sale, Fair Value | 69,060 | 96,245
Common Stock [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Amortized Cost |  | 333,294
Available for sale, Gross Unrealized Gains |  | 6,817
Available for sale, Gross Unrealized Losses |  | 525
Available for sale, Fair Value |  | 339,586
State and Municipals, Taxable [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Amortized Cost | 15,842 | 16,490
Available for sale, Gross Unrealized Gains | 735 | 943
Available for sale, Gross Unrealized Losses | 32 | 26
Available for sale, Fair Value | 16,545 | 17,407
State and Municipals, Tax-Exempt [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Amortized Cost | 121,099 |
Available for sale, Gross Unrealized Gains | 3,915 |
Available for sale, Gross Unrealized Losses | 90 |
Available for sale, Fair Value | $ 124,924 |
Total Amortized Cost, Held to maturity |  | 7,370
Held to maturity, Gross Unrealized Gains |  | 105
Held to maturity, Gross Unrealized Losses |  | 38
Held to maturity, Fair Value |  | 7,437
State and Municipals, Tax-Exempt [Member] | Corporate Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Amortized Cost |  | 87,954
Available for sale, Gross Unrealized Gains |  | 4,971
Available for sale, Gross Unrealized Losses |  | 24
Available for sale, Fair Value |  | $ 92,901

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