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Fair Value Measurements - Additional Information about Assets Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance at beginning of period $ 1,895 $ 33,749
Total gains (losses) - realized/unrealized, Included in earnings   13,766
Total gains (losses) - realized/unrealized, Included in other comprehensive income 16 5,676
Accretion included in earnings 5 662
Purchases 0 0
Issuances 0 0
Sales/redemptions   (51,527)
Settlements (237) (431)
Transfers from Level 3 (56)  
Transfers into Level 3 0 0
Balance at end of period 1,623 1,895
Pooled Trust Preferred Collateralized Debt Obligations [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance at beginning of period   31,595
Total gains (losses) - realized/unrealized, Included in earnings   13,766
Total gains (losses) - realized/unrealized, Included in other comprehensive income   5,608
Accretion included in earnings   657
Purchases 0 0
Issuances 0 0
Sales/redemptions   (51,527)
Settlements   (99)
Transfers into Level 3 0 0
Equity Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance at beginning of period 475 410
Total gains (losses) - realized/unrealized, Included in other comprehensive income 20 65
Purchases 0 0
Issuances 0 0
Transfers from Level 3 (56)  
Transfers into Level 3 0 0
Balance at end of period 439 475
Residential Non-Agency Collateralized Mortgage Obligations [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance at beginning of period 1,420 1,744
Total gains (losses) - realized/unrealized, Included in other comprehensive income (4) 3
Accretion included in earnings 5 5
Purchases 0 0
Issuances 0 0
Settlements (237) (332)
Transfers into Level 3 0 0
Balance at end of period $ 1,184 $ 1,420