XML 43 R32.htm IDEA: XBRL DOCUMENT v3.20.2
Investment Securities - Summary of Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Schedule of Investments [Line Items]    
Amortized Cost, Available-for-sale $ 2,150,364 $ 1,718,357
Gross Unrealized Holding Gain, Available-for-sale 55,496 23,548
Gross Unrealized Holding Loss, Available-for-sale (214) (1,648)
Fair Value, Available-for-sale $ 2,205,646 $ 1,740,257
Total Percent, Available-for-sale 100.00% 100.00%
Amortized Cost, Held-to-maturity $ 577,694 $ 674,452
Gross Unrealized Holding Gain, Held-to-maturity 26,166 8,230
Gross Unrealized Holding Loss, Held-to-maturity (338) (3,734)
Fair Value, Held-to-maturity $ 603,522 $ 678,948
Total Percent, Held-to-maturity 100.00% 100.00%
CMO/REMIC [Member]    
Schedule of Investments [Line Items]    
Amortized Cost, Available-for-sale $ 404,380 $ 493,214
Gross Unrealized Holding Gain, Available-for-sale 7,326 1,392
Gross Unrealized Holding Loss, Available-for-sale (212) (896)
Fair Value, Available-for-sale $ 411,494 $ 493,710
Total Percent, Available-for-sale 18.66% 28.37%
Amortized Cost, Held-to-maturity $ 159,676 $ 192,548
Gross Unrealized Holding Gain, Held-to-maturity 5,315
Gross Unrealized Holding Loss, Held-to-maturity (2,458)
Fair Value, Held-to-maturity $ 164,991 $ 190,090
Total Percent, Held-to-maturity 27.64% 28.55%
Government Agency/GSE [Member]    
Schedule of Investments [Line Items]    
Amortized Cost, Held-to-maturity $ 103,317 $ 117,366
Gross Unrealized Holding Gain, Held-to-maturity 6,627 2,280
Gross Unrealized Holding Loss, Held-to-maturity (657)
Fair Value, Held-to-maturity $ 109,944 $ 118,989
Total Percent, Held-to-maturity 17.88% 17.40%
Mortgage-backed Securities [Member]    
Schedule of Investments [Line Items]    
Amortized Cost, Available-for-sale $ 1,710,160 $ 1,185,757
Gross Unrealized Holding Gain, Available-for-sale 46,713 21,306
Gross Unrealized Holding Loss, Available-for-sale (2) (750)
Fair Value, Available-for-sale $ 1,756,871 $ 1,206,313
Total Percent, Available-for-sale 79.65% 69.32%
Amortized Cost, Held-to-maturity $ 152,285 $ 168,479
Gross Unrealized Holding Gain, Held-to-maturity 7,837 2,083
Gross Unrealized Holding Loss, Held-to-maturity (54)
Fair Value, Held-to-maturity $ 160,122 $ 170,508
Total Percent, Held-to-maturity 26.36% 24.98%
Municipal Bonds [Member]    
Schedule of Investments [Line Items]    
Amortized Cost, Available-for-sale $ 35,011 $ 38,506
Gross Unrealized Holding Gain, Available-for-sale 1,457 850
Gross Unrealized Holding Loss, Available-for-sale (2)
Fair Value, Available-for-sale $ 36,468 $ 39,354
Total Percent, Available-for-sale 1.65% 2.26%
Amortized Cost, Held-to-maturity $ 162,416 $ 196,059
Gross Unrealized Holding Gain, Held-to-maturity 6,387 3,867
Gross Unrealized Holding Loss, Held-to-maturity (338) (565)
Fair Value, Held-to-maturity $ 168,465 $ 199,361
Total Percent, Held-to-maturity 28.12% 29.07%
Other Securities [Member]    
Schedule of Investments [Line Items]    
Amortized Cost, Available-for-sale $ 813 $ 880
Gross Unrealized Holding Gain, Available-for-sale
Gross Unrealized Holding Loss, Available-for-sale
Fair Value, Available-for-sale $ 813 $ 880
Total Percent, Available-for-sale 0.04% 0.05%