Annual report pursuant to Section 13 and 15(d)

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

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Accumulated Other Comprehensive Income (Loss) - Activity in Accumulated Other Comprehensive Income (Detail) - USD ($)
 12 Months Ended
Jan. 01, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Reclassification from accumulated other comprehensive income   $ (1,295,000) $ (87,000) $ (1,748,000)
Balance at beginning of period   (2,457,000)    
Balance at end of period   1,370,000 (2,457,000)  
Balance at beginning of period $ 562,477,000 552,568,000 562,477,000 531,025,000
Other comprehensive income (loss), net of tax   9,461,000 (4,193,000) 525,000
Balance at end of period   563,267,000 552,568,000 562,477,000
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) (8,536,000) (3,188,000) (4,089,000)
Other comprehensive income (loss) before reclassification   14,583,000 (5,790,000) 2,649,000
Reclassification from accumulated other comprehensive income   (1,295,000) (87,000) (1,748,000)
Adjustments to accumulated other comprehensive income 529,000   529,000  
Net current period other comprehensive income   13,288,000 (5,348,000) 901,000
Balance at end of period   4,752,000 (8,536,000) (3,188,000)
Tax Benefit (Expense)        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance at beginning of period 1,319,000 2,457,000 1,319,000 1,695,000
Other comprehensive income (loss) before reclassification   (3,827,000) 1,684,000 (376,000)
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   (3,827,000) 1,138,000 (376,000)
Balance at end of period   (1,370,000) 2,457,000 1,319,000
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) (6,079,000) (1,869,000) (2,394,000)
Other comprehensive income (loss) before reclassification   10,756,000 (4,106,000) 2,273,000
Reclassification from accumulated other comprehensive income   (1,295,000) (87,000) (1,748,000)
Adjustments to accumulated other comprehensive income $ (17,000)   (17,000)  
Other comprehensive income (loss), net of tax   9,461,000 (4,210,000) 525,000
Balance at end of period   $ 3,382,000 $ (6,079,000) $ (1,869,000)