Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.1
Accumulated Other Comprehensive Income - Activity in Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
3 Months Ended
Jan. 01, 2018
Mar. 31, 2019
Mar. 31, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at beginning of period $ 562,477 $ 552,568 $ 562,477
Other comprehensive income (loss), net of tax   4,197 (6,321)
Balance at end of period   564,292 564,278
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) (8,536) (3,188)
Other comprehensive income before reclassification, before tax   6,619 (8,864)
Reclassification from accumulated other comprehensive income, before tax   (725) 529
Adjustment to accumulated other comprehensive income related to adoption of ASU 2016-01 and 2018-02, before tax 529    
Period change, before tax   5,894 (8,335)
Balance at end of period   (2,642) (11,523)
Tax Benefit (Expense)      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at beginning of period, tax 1,319 2,457 1,319
Other comprehensive (loss) income before reclassification, tax   (1,697) 2,543
Reclassification from accumulated other comprehensive income, tax   0 (546)
Adjustment to accumulated other comprehensive income related to adoption of ASU 2016-01 and 2018-02, tax (546)    
Period change, tax   (1,697) 1,997
Balance at end of period, tax   760 3,316
Accumulated Other Comprehensive Income (Loss)      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at beginning of period (1,869) (6,079) (1,869)
Other comprehensive income before reclassification, net of tax   4,922 (6,321)
Reclassification from accumulated other comprehensive income   (725) (17)
Adjustment to accumulated other comprehensive income related to adoption of ASU 2016-01 and 2018-02, net of tax $ (17)    
Other comprehensive income (loss), net of tax   4,197 (6,338)
Balance at end of period   $ (1,882) $ (8,207)