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Fair Value - Quantitative Information about Significant Unobservable Inputs Used in Fair Value Measurements (Detail)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Commercial Real Estate [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 17,146 $ 29,125
Valuation Techniques Fair value of collateral  
Commercial Loan [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 4,781 $ 7,242
Valuation Techniques Fair value of collateral  
Minimum [Member] | Measurement Input, Discount Rate [Member] | Commercial Real Estate [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Discount for type of property, age of appraisal and current status 0.00 0.00
Minimum [Member] | Measurement Input, Discount Rate [Member] | Commercial Loan [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Discount for type of property, age of appraisal and current status 0.00 0.00
Maximum [Member] | Measurement Input, Discount Rate [Member] | Commercial Real Estate [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Discount for type of property, age of appraisal and current status 0.50 0.50
Maximum [Member] | Measurement Input, Discount Rate [Member] | Commercial Loan [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Discount for type of property, age of appraisal and current status 0.90 0.90
Weighted Average [Member] | Measurement Input, Discount Rate [Member] | Commercial Real Estate [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Discount for type of property, age of appraisal and current status 0.35 0.35
Weighted Average [Member] | Measurement Input, Discount Rate [Member] | Commercial Loan [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Discount for type of property, age of appraisal and current status 0.41 0.35
Pooled Trust Preferred Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 8,123 $ 8,495
Valuation Techniques Discounted cash flow Discounted cash flow
Expected asset recoveries 0.00% 0.00%
Pooled Trust Preferred Securities [Member] | Constant Prepayment Rate [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Constant prepayment rate 0.00% 0.00%
Pooled Trust Preferred Securities [Member] | Minimum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Additional asset defaults 3.60% 6.80%
Pooled Trust Preferred Securities [Member] | Maximum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Additional asset defaults 4.20% 8.50%
Pooled Trust Preferred Securities [Member] | Weighted Average [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Additional asset defaults 4.00% 7.30%
States and Political Subdivisions [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 40 $ 4,108
Valuation Techniques Discounted cash flow Discounted cash flow
Commercial Foreclosed Assets [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 225  
Valuation Techniques Fair value of collateral  
Commercial Foreclosed Assets [Member] | Measurement Input, Discount Rate [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Discount for type of property, age of appraisal and current status 0.08  
Residential Foreclosed Assets [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value   $ 68
Residential Foreclosed Assets [Member] | Minimum [Member] | Measurement Input, Discount Rate [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Discount for type of property, age of appraisal and current status   0.15
Residential Foreclosed Assets [Member] | Maximum [Member] | Measurement Input, Discount Rate [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Discount for type of property, age of appraisal and current status   0.16
Residential Foreclosed Assets [Member] | Weighted Average [Member] | Measurement Input, Discount Rate [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Discount for type of property, age of appraisal and current status   0.15