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Other Comprehensive Income (Loss) - Other Comprehensive Income (Loss) Components and Related Tax Effects (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Accumulated Other Comprehensive Income Loss [Line Items]                
Balance $ 317,554 $ 314,709 $ 309,334 $ 301,484 $ 296,195 $ 294,265 $ 309,334 $ 294,265
Other comprehensive income before reclassifications 2,608     (1,741)     9,062 (7,010)
Accretion of unrealized losses of securities transferred from available for sale to held to maturity recognized in other comprehensive income       35     33 96
Reclassification adjustment for gains realized in income (101)           (332) (184)
Total other comprehensive income (loss) 2,507 3,236 3,020 (1,706) (1,402) (3,990) 8,763 (7,098)
Balance 326,856 317,554 314,709 306,043 301,484 296,195 326,856 306,043
Unrealized Gains (Losses) on Securities Available for Sale [Member]                
Accumulated Other Comprehensive Income Loss [Line Items]                
Balance 1,930   (3,781) (6,357)   (904) (3,781) (904)
Other comprehensive income before reclassifications 2,608     (1,741)     9,062 (7,010)
Transfer of held to maturity securities to available for sale             (512)  
Reclassification adjustment for gains realized in income (101)           (332) (184)
Total other comprehensive income (loss) 2,507     (1,741)     8,218 (7,194)
Balance 4,437 1,930   (8,098) (6,357)   4,437 (8,098)
Disproportionate Tax Effect from Securities Available for Sale [Member]                
Accumulated Other Comprehensive Income Loss [Line Items]                
Balance (17,110)   (17,110) (17,110)   (17,110) (17,110) (17,110)
Balance (17,110) (17,110)   (17,110) (17,110)   (17,110) (17,110)
Losses on Securities Transferred From Available for Sale to Held to Maturity [Member]                
Accumulated Other Comprehensive Income Loss [Line Items]                
Balance     (545) (610)   (671) (545) (671)
Accretion of unrealized losses of securities transferred from available for sale to held to maturity recognized in other comprehensive income       35     33 96
Transfer of held to maturity securities to available for sale             512  
Total other comprehensive income (loss)       35     545 96
Balance       (575) (610)     (575)
Accumulated Other Comprehensive Income (Loss) [Member]                
Accumulated Other Comprehensive Income Loss [Line Items]                
Balance (15,180) (18,416) (21,436) (24,077) (22,675) (18,685) (21,436) (18,685)
Total other comprehensive income (loss) 2,507 3,236 3,020 (1,706) (1,402) (3,990)    
Balance $ (12,673) $ (15,180) $ (18,416) $ (25,783) $ (24,077) $ (22,675) $ (12,673) $ (25,783)