XML 99 R65.htm IDEA: XBRL DOCUMENT v3.20.1
Investment Securities - Age of Unrealized Losses and Fair Value of Related Securities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Fair Value    
Less than Twelve Months $ 289,110 $ 156,682
More than Twelve Months 306,513 1,456,424
Total 595,623 1,613,106
Unrealized Losses    
Less than Twelve Months (1,347) (1,050)
More than Twelve Months (4,235) (47,805)
Total (5,582) (48,855)
U.S. Treasury securities    
Fair Value    
Less than Twelve Months 25,019 0
More than Twelve Months 0 49,306
Total 25,019 49,306
Unrealized Losses    
Less than Twelve Months (21) 0
More than Twelve Months 0 (1,669)
Total (21) (1,669)
U.S. government agency securities    
Fair Value    
Less than Twelve Months 0 2,120
More than Twelve Months 1,783 26,775
Total 1,783 28,895
Unrealized Losses    
Less than Twelve Months 0 (20)
More than Twelve Months (19) (618)
Total (19) (638)
Obligations of states and state agencies    
Fair Value    
Less than Twelve Months 18,540 17,560
More than Twelve Months 8,755 75,718
Total 27,295 93,278
Unrealized Losses    
Less than Twelve Months (21) (95)
More than Twelve Months (62) (3,587)
Total (83) (3,682)
Municipal bonds    
Fair Value    
Less than Twelve Months 0 5,018
More than Twelve Months 13,177 70,286
Total 13,177 75,304
Unrealized Losses    
Less than Twelve Months 0 (106)
More than Twelve Months (86) (1,331)
Total (86) (1,437)
Obligations of states and political subdivisions    
Fair Value    
Less than Twelve Months 18,540 22,578
More than Twelve Months 21,932 146,004
Total 40,472 168,582
Unrealized Losses    
Less than Twelve Months (21) (201)
More than Twelve Months (148) (4,918)
Total (169) (5,119)
Residential mortgage-backed securities    
Fair Value    
Less than Twelve Months 240,412 119,645
More than Twelve Months 282,798 1,221,942
Total 523,210 1,341,587
Unrealized Losses    
Less than Twelve Months (1,194) (668)
More than Twelve Months (4,068) (40,093)
Total (5,262) (40,761)
Corporate and other debt securities    
Fair Value    
Less than Twelve Months 5,139 12,339
More than Twelve Months 0 12,397
Total 5,139 24,736
Unrealized Losses    
Less than Twelve Months (111) (161)
More than Twelve Months 0 (507)
Total $ (111) $ (668)