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Investment Securities (Detail Textuals)
 9 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
Security
Dec. 31, 2014
USD ($)
Security
Investments Debt And Equity Securities Abstract    
Available for sale securities, restricted $ 9,200,000 $ 4,700,000
Available for sale securities, pledged $ 208,900,000 $ 145,500,000
Number of securities consisted in portfolio | Security 317 300
Number of securities in loss position | Security 62 74
Unrealized loss included in other comprehensive $ 81,300,000 $ 82,200,000
Loss position for 12 months or longer 36,386,000 65,249,000
Aggregate unrealized loss included in accumulated other comprehensive income $ 696,000 $ 1,300,000