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Fair Value - Reconciliation of All Assets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3) (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
States and Political Subdivisions [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Transfers into Level 3   $ 4,100
Transfers out of Level 3 $ 4,000  
Significant Unobservable Inputs (Level 3) [Member] | Pooled Trust Preferred Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance at beginning of period 8,495 8,448
Accretion (amortization) of discount 4 5
Sales/payments received (15) (288)
Increase (decrease) in fair value of securities (361) 30
Transfers into Level 3   0
Balance at end of period 8,123 8,195
Significant Unobservable Inputs (Level 3) [Member] | States and Political Subdivisions [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance at beginning of period 4,108 0
Accretion (amortization) of discount   0
Sales/payments received (35) 0
Increase (decrease) in fair value of securities   0
Transfers into Level 3   4,061
Transfers out of Level 3 (4,033)  
Balance at end of period $ 40 $ 4,061