Changes in Mortgage Servicing Rights (Detail) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
|
| Servicing Asset at Amortized Cost [Line Items] | ||||
| Balance at beginning of period | $ 457 | $ 475 | $ 479 | $ 476 |
| Capitalization | 4 | 16 | 50 | 93 |
| Amortization | (27) | (24) | (72) | (71) |
| Valuation allowance adjustment | (48) | 13 | (71) | (18) |
| Balance at end of period | $ 386 | $ 480 | $ 386 | $ 480 |