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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
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance at beginning of period $ 1,623 $ 1,895
Total gains (losses) - realized/unrealized, Included in earnings 0 0
Total gains (losses) - realized/unrealized, Included in other comprehensive income (43) 16
Accretion included in earnings 2 5
Purchases 0 0
Issuances 0 0
Sales/redemptions 0 0
Settlements (67) (237)
Transfers from Level 3   (56)
Transfers into Level 3 0 0
Balance at end of period 1,515 1,623
Equity Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance at beginning of period 439 475
Total gains (losses) - realized/unrealized, Included in earnings 0 0
Total gains (losses) - realized/unrealized, Included in other comprehensive income (15) 20
Purchases 0 0
Issuances 0 0
Sales/redemptions 0 0
Transfers from Level 3   (56)
Transfers into Level 3 0 0
Balance at end of period 424 439
Residential Non-Agency Collateralized Mortgage Obligations [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance at beginning of period 1,184 1,420
Total gains (losses) - realized/unrealized, Included in earnings 0 0
Total gains (losses) - realized/unrealized, Included in other comprehensive income (28) (4)
Accretion included in earnings 2 5
Purchases 0 0
Issuances 0 0
Sales/redemptions 0 0
Settlements (67) (237)
Transfers into Level 3 0 0
Balance at end of period $ 1,091 $ 1,184