Quarterly report pursuant to Section 13 or 15(d)

Accumulated Other Comprehensive Income - Activity in Accumulated Other Comprehensive Income (Detail)

v3.19.3
Accumulated Other Comprehensive Income - Activity in Accumulated Other Comprehensive Income (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
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Balance at beginning of period $ 562,477 $ 564,292 $ 564,278 $ 552,568 $ 562,477
Other comprehensive income (loss), net of tax   4,257 (1,117) 8,454 (7,438)
Balance at end of period   564,458 571,707 564,458 571,707
Unrealized Gains and Losses on Available for Sale Securities          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Balance at beginning of period (3,188) (2,642) (11,523) (8,536) (3,188)
Other comprehensive income before reclassification, before tax   6,548 (1,502) 13,167 (10,366)
Reclassification from accumulated other comprehensive income, before tax   (570) (67) (1,295) (67)
Adjustment to accumulated other comprehensive income related to adoption of ASU 2016-01 and 2018-02, before tax 529       529
Period change, before tax   5,978 (1,569) 11,872 (9,904)
Balance at end of period   3,336 (13,092) 3,336 (13,092)
Tax Benefit (Expense)          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Balance at beginning of period, tax 1,319 760 3,316 2,457 1,319
Other comprehensive (loss) income before reclassification, tax   (1,721) 452 (3,418) 2,995
Reclassification from accumulated other comprehensive income, tax       0 0
Adjustment to accumulated other comprehensive income related to adoption of ASU 2016-01 and 2018-02, tax (546)       (546)
Period change, tax   (1,721) 452 (3,418) 2,449
Balance at end of period, tax   (961) 3,768 (961) 3,768
Accumulated Other Comprehensive Income (Loss)          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Balance at beginning of period (1,869) (1,882) (8,207) (6,079) (1,869)
Other comprehensive income before reclassification, net of tax   4,827 (1,050) 9,749 (7,371)
Reclassification from accumulated other comprehensive income   (570) (67) (1,295) (67)
Adjustment to accumulated other comprehensive income related to adoption of ASU 2016-01 and 2018-02, net of tax $ (17)       (17)
Other comprehensive income (loss), net of tax   4,257 (1,117) 8,454 (7,455)
Balance at end of period   $ 2,375 $ (9,324) $ 2,375 $ (9,324)