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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, 2017
Dec. 31, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance at beginning of period $ 1,386 $ 1,623
Total gains (losses) - realized/unrealized, Included in earnings 4  
Total gains (losses) - realized/unrealized, Included in other comprehensive income 80 46
Accretion included in earnings   6
Purchases 12,048  
Issuances 0 0
Sales/redemptions (874)  
Settlements (19) (289)
Transfers from Level 3 (578)  
Transfers into Level 3 1,252  
Balance at end of period 13,299 1,386
Other Debt Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Accretion included in earnings (1)  
Purchases 12,048  
Issuances 0 0
Balance at end of period 12,047  
Equity Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance at beginning of period 492 439
Total gains (losses) - realized/unrealized, Included in other comprehensive income 86 53
Issuances 0 0
Transfers from Level 3 (578)  
Balance at end of period   492
Residential Non-Agency Collateralized Mortgage Obligations [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance at beginning of period 894 1,184
Total gains (losses) - realized/unrealized, Included in earnings 4  
Total gains (losses) - realized/unrealized, Included in other comprehensive income (6) (7)
Accretion included in earnings 1 6
Issuances 0 0
Sales/redemptions (874)  
Settlements (19) (289)
Balance at end of period   894
Interest Rate Lock Commitments [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Issuances 0 $ 0
Transfers into Level 3 1,252  
Balance at end of period $ 1,252