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Fair Values of Assets and Liabilities - Schedule of Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 | $ (536) |  | $ (536) |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance, beginning of period | 35,479 | $ 33,054 | 37,828 | $ 30,419
Total gains or losses included in earnings | 0 | 0 | 0 | 105
Total gains or losses included in other comprehensive income | 480 | 4,851 | (1,905) | 7,471
Purchases | 168 | 0 | 204 | 500
Issuances | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements | 30 | 464 | (30) | (1,054)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 | 536 | 0 | 536 | 0
Balance, end of period | 36,097 | 37,441 | 36,097 | 37,441
Pooled Trust Preferred Collateralized Debt Obligations [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 | 0 |  | 0 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance, beginning of period | 33,273 | 31,134 | 35,658 | 28,999
Total gains or losses included in earnings | 0 | 0 | 0 | 105
Total gains or losses included in other comprehensive income | 480 | 4,851 | (1,905) | 7,471
Purchases | 0 | 0 | 0 | 0
Issuances | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements | 30 | 464 | (30) | (1,054)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 | 0 | 0 | 0 | 0
Balance, end of period | 33,723 | 35,521 | 33,723 | 35,521
Equity Securities [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 | 536 |  | 536 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance, beginning of period | 2,206 | 1,920 | 2,170 | 1,420
Total gains or losses included in earnings | 0 | 0 | 0 | 0
Total gains or losses included in other comprehensive income | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 36 | 500
Issuances | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 | 0 | 0 | 0 | 0
Balance, end of period | 1,670 | $ 1,920 | 1,670 | $ 1,920
Other Assets [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 | 0 |  | 0 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance, beginning of period | 0 |  | 0 |
Total gains or losses included in earnings | 0 |  | 0 |
Total gains or losses included in other comprehensive income | 0 |  | 0 |
Purchases | 168 |  | 168 |
Issuances | 0 |  | 0 |
Sales | 0 |  | 0 |
Settlements | 0 |  | 0 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 | 536 |  | 536 |
Balance, end of period | $ 704 |  | $ 704 |

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