Annual report pursuant to Section 13 and 15(d)

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

v3.20.4
Accumulated Other Comprehensive Income (Loss) - Activity in Accumulated Other Comprehensive Income (Detail) - USD ($)
 12 Months Ended
Jan. 01, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Reclassification from accumulated other comprehensive income   $ (15,712,000) $ (1,295,000) $ (87,000)
Balance at beginning of period   1,370,000    
Balance at end of period   1,247,000 1,370,000  
Balance at beginning of period $ 562,477,000 563,267,000 552,568,000 562,477,000
Other comprehensive income (loss), net of tax   (306,000) 9,461,000 (4,193,000)
Balance at end of period   577,044,000 563,267,000 552,568,000
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 (3,188,000) 4,752,000 (8,536,000) (3,188,000)
Other comprehensive income (loss) before reclassification   15,283,000 14,583,000 (5,790,000)
Reclassification from accumulated other comprehensive income   (15,712,000) (1,295,000) (87,000)
Adjustments to accumulated other comprehensive income 529,000     529,000
Net current period other comprehensive income   (429,000) 13,288,000 (5,348,000)
Balance at end of period   4,323,000 4,752,000 (8,536,000)
Tax Benefit (Expense)        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance at beginning of period 1,319,000 (1,370,000) 2,457,000 1,319,000
Other comprehensive income (loss) before reclassification   123,000 (3,827,000) 1,684,000
Reclassification from accumulated other comprehensive income   0 0 0
Adjustments to accumulated other comprehensive income (546,000)     (546,000)
Net current period other comprehensive income   123,000 (3,827,000) 1,138,000
Balance at end of period   (1,247,000) (1,370,000) 2,457,000
Accumulated Other Comprehensive Income (Loss)        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance at beginning of period (1,869,000) 3,382,000 (6,079,000) (1,869,000)
Other comprehensive income (loss) before reclassification   15,406,000 10,756,000 (4,106,000)
Reclassification from accumulated other comprehensive income   (15,712,000) (1,295,000) (87,000)
Adjustments to accumulated other comprehensive income $ (17,000)     (17,000)
Other comprehensive income (loss), net of tax   (306,000) 9,461,000 (4,210,000)
Balance at end of period   $ 3,076,000 $ 3,382,000 $ (6,079,000)