Fair Value Measurement - Reconciliation of Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3) on Recurring Basis (Detail) - Mortgage servicing rights [Member] - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
---|---|---|---|---|
Jun. 30, 2015 |
Jun. 30, 2014 |
Jun. 30, 2015 |
Jun. 30, 2014 |
|
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] | ||||
Balance at beginning of period | $ 7,057 | $ 6,107 | $ 7,378 | $ 6,165 |
Issuances | 235 | 153 | 421 | 276 |
Change included in earnings | 522 | (351) | 15 | (532) |
Balance at end of period | $ 7,814 | $ 5,909 | $ 7,814 | $ 5,909 |