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Investment Securities - Narrative (Detail)
$ in Thousands
6 Months Ended
Jun. 30, 2019
USD ($)
Investment
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Investment
Debt Securities, Available-for-sale [Line Items]      
Carrying value of securities pledged to secure public deposits and other contractual obligations $ 379,000   $ 344,500
Pledging requirements for credit derivatives and SWAP agreements - securities $ 9,900   $ 296
Number of investments in non-federal issuer representing more than 10% of shareholders' equity | Investment 0   0
Maximum investment in any single non-federal issuer representing shareholders' equity 10.00%   10.00%
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss $ (7,225)   $ (14,180)
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year 110    
Proceeds from sales $ 15,494 $ 1,010  
U.S. Government Corporations and Agencies [Member]      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss $ (16)   (96)
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year 3    
Corporate Bonds [Member]      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss $ (6,206)   (9,099)
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year 16    
Mortgage-Backed Securities [Domain]      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss $ (1,000)    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year 90    
State and Political Subdivisions [Member]      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss     (164)
Collateralized Mortgage Obligations [Member]      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss $ (31)   $ (78)
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year 1    
Equity Securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Proceeds from sales $ 0    
Other Noninterest Income [Member] | Equity Securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Net realized gain on investment securities $ 20 $ 33