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Investment Securities - Unrealized Losses and Fair Value of Investment Securities in Continuous Unrealized Loss Position (Detail)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
positions
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
positions
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
positions
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | positions 50   50   158
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses $ 2,113   $ 2,113   $ 4,023
Available-for-sale securities, Less Than Twelve Months, Fair Value 158,197   158,197   799,113
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses 22,278   22,278   15,847
Available-for-sale securities, Twelve Months or Longer, Fair Value 116,869   116,869   585,688
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total 24,391   24,391   19,870
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total 275,066   275,066   1,384,801
Unrealized gains (losses) on assets measured at fair value, net 4,432 $ 1,572 (6,868) $ 4,406  
Corporate Bond Securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses 30   30   0
Available-for-sale securities, Less Than Twelve Months, Fair Value 4,356   4,356   0
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses 13,150   13,150   5,166
Available-for-sale securities, Twelve Months or Longer, Fair Value 86,850   86,850   94,834
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total 13,180   13,180   5,166
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total 91,206   91,206   94,834
Taxable Municipal Bonds [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses 169   169    
Available-for-sale securities, Less Than Twelve Months, Fair Value 7,330   7,330    
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses 0   0    
Available-for-sale securities, Twelve Months or Longer, Fair Value 0   0    
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total 169   169    
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total 7,330   7,330    
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses 224   224   1,740
Available-for-sale securities, Less Than Twelve Months, Fair Value 46,854   46,854   385,643
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses 2   2   2,077
Available-for-sale securities, Twelve Months or Longer, Fair Value 412   412   150,419
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total 226   226   3,817
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total 47,266   47,266   536,062
Nontaxable Municipal Bonds [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss         149
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value         24,325
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss         0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value         0
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain         149
Held-to-maturity Securities, Fair Value         24,325
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses 913   913   422
Available-for-sale securities, Less Than Twelve Months, Fair Value 64,845   64,845   67,150
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses 0   0   0
Available-for-sale securities, Twelve Months or Longer, Fair Value 0   0   0
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total 913   913   422
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total 64,845   64,845   67,150
Residential Mortgage Backed Securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses 777   777   1,776
Available-for-sale securities, Less Than Twelve Months, Fair Value 34,812   34,812   337,285
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses 15   15   2,554
Available-for-sale securities, Twelve Months or Longer, Fair Value 6,718   6,718   258,791
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total 792   792   4,330
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total 41,530   41,530   596,076
Trust Preferred Securities Subject to Mandatory Redemption [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses 0   0   0
Available-for-sale securities, Less Than Twelve Months, Fair Value 0   0   0
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses 9,111   9,111   4,960
Available-for-sale securities, Twelve Months or Longer, Fair Value 22,889   22,889   27,040
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total 9,111   9,111   4,960
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total $ 22,889   $ 22,889   27,040
Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses         85
Available-for-sale securities, Less Than Twelve Months, Fair Value         9,035
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses         1,090
Available-for-sale securities, Twelve Months or Longer, Fair Value         54,604
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total         1,175
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total         $ 63,639