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Investment Securities (Narrative) (Detail)
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
security
position
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
security
position
Sep. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jan. 01, 2020
USD ($)
Dec. 31, 2019
USD ($)
security
position
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Schedule of Held-to-maturity Securities [Line Items]                  
Available for sale debt securities, at fair value $ 1,100,391,000   $ 1,100,391,000       $ 976,919,000    
Securities held to maturity, at fair value $ 446,591,000   $ 446,591,000       $ 453,629,000    
Total number of all held to maturity and available for sale securities in an unrealized loss position | security 68   68       85    
Allowance for credit losses $ (76,000)   $ (76,000)     $ 70,000 $ 0    
Retained earnings 694,240,000   694,240,000       695,273,000    
Securities available for sale, amortized cost $ 1,067,874,000   1,067,874,000       $ 965,135,000    
Proceeds from sales of securities     $ 13,905,000 $ 0          
Securities available for sale, number of securities in an unrealized loss position | position 55   55       50    
Unrealized loss $ 1,278,000   $ 1,278,000       $ 1,148,000    
Held to maturity securities, proceeds from calls 13,700,000 $ 14,400,000 39,500,000 26,600,000          
Held to maturity securities, recognized gain on calls 0 0 55,000 0          
Held to maturity securities, recognized loss on calls 0                
Investment securities held to maturity, fair value 467,693,000   467,693,000       467,966,000    
Allowance for credit losses $ 106,314,000 $ 57,344,000 $ 106,314,000 $ 57,344,000 $ 86,259,000 55,525,000 $ 55,525,000 $ 62,810,000 $ 55,562,000
Number of securities in an unrealized loss position | security 13   13       35    
AAA                  
Schedule of Held-to-maturity Securities [Line Items]                  
Securities held to maturity, at fair value $ 59,303,000   $ 59,303,000       $ 56,033,000    
Amount of total portfolio     13.00%            
AA                  
Schedule of Held-to-maturity Securities [Line Items]                  
Securities held to maturity, at fair value 315,772,000   $ 315,772,000       333,450,000    
Amount of total portfolio     71.00%            
A                  
Schedule of Held-to-maturity Securities [Line Items]                  
Securities held to maturity, at fair value 60,033,000   $ 60,033,000       62,652,000    
Amount of total portfolio     13.00%            
A rated or not rated                  
Schedule of Held-to-maturity Securities [Line Items]                  
Amount of total portfolio     2.00%            
Private Label Mortgage-Backed Securities                  
Schedule of Held-to-maturity Securities [Line Items]                  
Securities available for sale, amortized cost $ 17,000,000   $ 17,000,000            
Securities available for sale, number of securities in an unrealized loss position | position 1   1            
Unrealized loss $ 2,000,000   $ 2,000,000            
Accounting Standards Update 2016-13                  
Schedule of Held-to-maturity Securities [Line Items]                  
Allowance for credit losses           70,000      
Allowance for credit losses           7,900,000      
Accounting Standards Update 2016-13, Effect On Debt Securities                  
Schedule of Held-to-maturity Securities [Line Items]                  
Retained earnings           $ 52,000      
Mortgage-Backed Securities                  
Schedule of Held-to-maturity Securities [Line Items]                  
Available for sale debt securities, at fair value 934,171,000   934,171,000       947,430,000    
Allowance for credit losses 0   0       0    
Securities available for sale, amortized cost 903,628,000   903,628,000       936,196,000    
Unrealized loss 864,000   864,000       1,133,000    
Held-to-maturity securities, amortized cost 75,000   75,000            
Investment securities held to maturity, fair value 77,000   77,000       122,000    
Allowance for credit losses 76,000   76,000            
Mortgage-Backed Securities | AAA                  
Schedule of Held-to-maturity Securities [Line Items]                  
Securities held to maturity, at fair value 75,000   75,000       118,000    
Mortgage-Backed Securities | AA                  
Schedule of Held-to-maturity Securities [Line Items]                  
Securities held to maturity, at fair value 0   0       0    
Mortgage-Backed Securities | A                  
Schedule of Held-to-maturity Securities [Line Items]                  
Securities held to maturity, at fair value $ 0   $ 0       $ 0