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Securities (Details Textual) (USD $)
 3 Months Ended 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Dec. 31, 2012
Jun. 30, 2012
Other-Than-Temporarily Impaired CDO
Mar. 31, 2014
Other-Than-Temporarily Impaired CDO
position
Mar. 31, 2014
Minimum [Member]
Mar. 31, 2014
Minimum [Member]
Other-Than-Temporarily Impaired CDO
Mar. 31, 2014
Minimum [Member]
Standard Poors [Member]
Mar. 31, 2014
Minimum [Member]
Moody Investor Service [Member]
Mar. 31, 2014
Maximum [Member]
Mar. 31, 2014
Maximum [Member]
Other-Than-Temporarily Impaired CDO
Mar. 31, 2014
Maximum [Member]
Standard Poors [Member]
Mar. 31, 2014
Maximum [Member]
Moody Investor Service [Member]
Schedule of Available-for-sale Securities [Line Items]                            
Gain on sale of investments   $ 4,000                        
Loss on sale of investments 0       11,000                  
Gross unrealized losses 19,503,000   26,684,000                      
Number of positions in loss position greater than 12 months           3                
Contractual balance           26,200,000                
Reduced balance           12,500,000                
Interest payment received           1,500,000                
Cumulative OTTI charges 14,079,000 14,983,000 14,079,000 14,983,000   14,100,000                
Other comprehensive income net           1,900,000                
OTTI, portion in other comprehensive loss, net of tax, available-for-sale securities 1,200,000                          
Severity of OTTI (as a percent)               28.00%       93.00%    
Base discount rate, which is subject to an additional margin 3 month LIBOR                          
Basis point spread on variable rate             1.60%       1.80%      
Amortized Cost 918,913,000   920,897,000     389,000                
Securities available-for-sale $ 921,165,000   $ 914,560,000     $ 351,000                
Credit Quality Indicator Pricing                 4.4 0.32     90.3 90.5