Quarterly report pursuant to Section 13 or 15(d)

Accumulated Other Comprehensive Income - Additional Information (Detail)

v3.19.3
Accumulated Other Comprehensive Income - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jan. 01, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Accumulated Other Comprehensive Income [Line Items]          
Net gain (loss) on sales of securities   $ 570 $ 67 $ 1,295 $ (361)
Net unrealized gains (losses) recorded in comprehensive income   792 95 586 95
Unrealized Gains and Losses on Available for Sale Securities          
Accumulated Other Comprehensive Income [Line Items]          
Reduction of unrealized losses related to securities $ 529       529
Accumulated Other Comprehensive Income (Loss)          
Accumulated Other Comprehensive Income [Line Items]          
Adjustment to accumulated other comprehensive income related to adoption of ASU 2016-01 and 2018-02, net of tax 17       17
Tax Benefit (Expense)          
Accumulated Other Comprehensive Income [Line Items]          
Reduction in tax benefits upon adoption of ASUs $ 546       546
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains and Losses on Available for Sale Securities          
Accumulated Other Comprehensive Income [Line Items]          
Net gain (loss) on sales of securities   $ 570 $ 67 $ 1,300 $ (361)