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Investments - Carrying value and estimated fair value (Details) (USD $) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Schedule of Available-for-sale Securities |  |  |
Available-for-sale investment securities, Amortized cost | $ 419,372,000 | $ 447,108,000 | $ 447,108,000
Gross Unrealized Gains | 6,098,000 | 5,145,000 |
Gross Unrealized Losses | (3,397,000) | (9,029,000) |
Available-for-sale investment securities | 422,073,000 | 443,224,000 |
Held-to-maturity Securities, Debt Maturities [Abstract] |  |  |
Estimated Fair Value | 32,047,000 |  |
U.S. Government agencies |  |  |
Schedule of Available-for-sale Securities |  |  |
Debt Securities, Amortized Cost | 17,968,000 | 18,172,000 |
Gross Unrealized Gains | 47,000 | 115,000 |
Gross Unrealized Losses | (40,000) | (84,000) |
Debt Securities, Estimated Fair Value | 17,975,000 | 18,203,000 |
Obligations of states and political subdivisions |  |  |
Schedule of Available-for-sale Securities |  |  |
Debt Securities, Amortized Cost | 123,678,000 | 162,018,000 |
Gross Unrealized Gains | 2,918,000 | 2,906,000 |
Gross Unrealized Losses | (2,082,000) | (6,517,000) |
Debt Securities, Estimated Fair Value | 124,514,000 | 158,407,000 |
Held-to-maturity Securities, Debt Maturities [Abstract] |  |  |
Amortized Cost Basis | 31,589,000 |  |
Gross Unrealized Gains | 504,000 |  |
Gross Unrealized Losses | (46,000) |  |
Estimated Fair Value | 32,047,000 |  |
U.S. Government agencies collateralized by residential mortgage obligations |  |  |
Schedule of Available-for-sale Securities |  |  |
Debt Securities, Amortized Cost | 266,173,000 | 254,978,000 |
Gross Unrealized Gains | 1,878,000 | 1,075,000 |
Gross Unrealized Losses | (1,226,000) | (2,344,000) |
Debt Securities, Estimated Fair Value | 266,825,000 | 253,709,000 |
Private label residential mortgage backed securities |  |  |
Schedule of Available-for-sale Securities |  |  |
Debt Securities, Amortized Cost | 3,957,000 | 4,344,000 |
Equity Securities, Amortized Cost | 21 |  |
Gross Unrealized Gains | 1,254,000 | 1,047,000 |
Gross Unrealized Losses | 0 | 0 |
Debt Securities, Estimated Fair Value | 5,211,000 | 5,391,000 |
Other equity securities |  |  |
Schedule of Available-for-sale Securities |  |  |
Equity Securities, Amortized Cost | 7,596,000 | 7,596,000 |
Gross Unrealized Gains | 1,000 | 2,000 |
Gross Unrealized Losses | (49,000) | (84,000) |
Equity Securities, Estimated Fair Value | $ 7,548,000 | $ 7,514,000 |

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