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Mortgage Servicing Rights - Fair Value of Mortgage Servicing Rights (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Servicing Assets at Fair Value [Line Items]          
Servicing, late and ancillary fees received $ 528 $ 421 $ 1,062 $ 841  
Weighted-average prepayment speed (CPR)     9.50% 11.00%  
Discount rate     10.00% 10.00%  
Loans [Member]          
Servicing Assets at Fair Value [Line Items]          
Balance at beginning of period 832,143 672,341 $ 840,288 $ 680,197 $ 680,197
Balance at end of period 827,333 667,969 827,333 667,969 840,288
Mortgage servicing rights [Member]          
Servicing Assets at Fair Value [Line Items]          
Balance at beginning of period 7,057 6,107 7,378 6,165 6,165
Additions 236 153 421 276  
Change in fair value 521 (351) 15 (532)  
Balance at end of period $ 7,814 $ 5,909 $ 7,814 $ 5,909 $ 7,378