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Investment Securities (Detail Textuals)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2015
USD ($)
Security
Dec. 31, 2014
USD ($)
Security
Investments Debt And Equity Securities Abstract    
Available for sale securities, restricted $ 7,900 $ 4,700
Available for sale securities, pledged $ 181,600 $ 145,500
Number of securities consisted in portfolio | Security 321 300
Number of securities in loss position | Security 110 74
Unrealized loss included in other comprehensive $ 128,200 $ 82,200
Loss position for 12 months or longer 41,387 65,249
Aggregate unrealized loss included in accumulated other comprehensive income $ 1,700 $ 1,300