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Selected Quaterly Finacial Data (Unaudited) (Details) (USD $)
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3 Months Ended | 12 Months Ended | |||||||||
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Dec. 31, 2013
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Sep. 30, 2013
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Jun. 30, 2013
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Mar. 31, 2013
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Dec. 31, 2012
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Sep. 30, 2012
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Jun. 30, 2012
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Mar. 31, 2012
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Quarterly Financial Data [Abstract] | |||||||||||
| Interest income | $ 16,610,000 | $ 16,286,000 | $ 15,732,000 | $ 15,057,000 | $ 14,404,000 | $ 13,688,000 | $ 12,831,000 | $ 12,052,000 | $ 63,685,000 | $ 52,975,000 | $ 44,269,000 |
| Fee income | 3,657,000 | 3,410,000 | 3,148,000 | 3,175,000 | 3,122,000 | 2,966,000 | 2,774,000 | 3,114,000 | 13,390,000 | 11,976,000 | 12,254,000 |
| Interest and fee income | 20,267,000 | 19,696,000 | 18,880,000 | 18,232,000 | 17,526,000 | 16,654,000 | 15,605,000 | 15,166,000 | 77,075,000 | 64,951,000 | 56,523,000 |
| Interest expense | 1,087,000 | 1,036,000 | 1,166,000 | 1,256,000 | 1,465,000 | 1,496,000 | 1,792,000 | 2,129,000 | 4,545,000 | 6,882,000 | 11,416,000 |
| Provision for credit losses | 3,257,000 | 2,303,000 | 1,893,000 | 2,164,000 | 2,373,000 | 1,414,000 | 1,031,000 | 1,102,000 | 9,617,000 | 5,920,000 | 4,134,000 |
| Income tax expense | 2,084,000 | 2,870,000 | 2,469,000 | 2,346,000 | 2,064,000 | 2,183,000 | 1,872,000 | 1,038,000 | 9,769,000 | 7,157,000 | 4,147,000 |
| Net income | 3,426,000 | 4,687,000 | 4,467,000 | 3,651,000 | 3,645,000 | 3,415,000 | 2,988,000 | 1,649,000 | 16,231,000 | 11,697,000 | 6,175,000 |
| Basic earnings per share | $ 0.26 | $ 0.37 | $ 0.35 | $ 0.29 | $ 0.29 | $ 0.27 | $ 0.24 | $ 0.13 | $ 1.26 | $ 0.92 | $ 0.48 |
| Diluted earnings per share | $ 0.26 | $ 0.36 | $ 0.34 | $ 0.28 | $ 0.28 | $ 0.27 | $ 0.23 | $ 0.13 | $ 1.25 | $ 0.91 | $ 0.48 |
| Cash dividends declared and paid per share | $ 0.11 | $ 2.11 | $ 0.1 | $ 0.1 | $ 0.08 | $ 0.08 | $ 0.06 | $ 0.06 | $ 2.42 | $ 0.28 | $ 0.06 |
| Net investment in leases and loans | 597,075,000 | 576,377,000 | 556,309,000 | 525,901,000 | 503,017,000 | 472,059,000 | 443,231,000 | 412,553,000 | 597,075,000 | 503,017,000 | |
| Total assets | $ 702,207,000 | $ 673,151,000 | $ 679,539,000 | $ 639,640,000 | $ 602,348,000 | $ 579,037,000 | $ 532,251,000 | $ 512,671,000 | $ 702,207,000 | $ 602,348,000 | |