XML 58 R48.htm IDEA: XBRL DOCUMENT v3.22.2.2
Securities Available for Sale - Summary of Securities Available for Sale (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost $ 2,321,695,000   $ 2,321,695,000   $ 2,685,648,000
Gross Unrealized Gains 9,000   9,000   16,266,000
Gross Unrealized Losses (328,356,000)   (328,356,000)   (35,639,000)
Fair Value 1,993,348,000   1,993,348,000   2,666,275,000
Debt Securities, Held-to-maturity, Fair Value 258,677,000   258,677,000   0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss 12,508,000   12,508,000    
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0   0    
Investment securities held to maturity, at amortized cost; fair value of $258,677 and $0 at September 30, 2022 and December 31, 2021, respectively 271,185,000   271,185,000   0
Fair value of debt securities transferred from available for sale to held to maturity 238,900,000        
Debt Securities, Transfer from available for sale to held to maturity, amortized cost, before allowance for credit losses 275,500,000        
Unrealized loss on debt securities transferred from available for sale to held to maturity (36,600,000)        
Net gains on sales of securities available for sale 0 $ 0 0 $ 0  
Unrealized gains on securities available for sale net of taxes (236,535,000)   (236,535,000)   (11,412,000)
Accrued interest receivable for investment securities available for sale 6,500,000   6,500,000   5,600,000
Debt Securities, Available For Sale and Held to Maturity, Restricted 369,500,000   369,500,000   362,200,000
Due within one year 2,616,000   2,616,000    
Due within one year 2,565,000   2,565,000    
Due within one year 0   0    
Due within one year 0   0    
Due after one year through five years 102,687,000   102,687,000    
Due after one year through five years 95,593,000   95,593,000    
Due after one year through five years 0   0    
Due after one year through five years 0   0    
Due after five years through ten years 159,709,000   159,709,000    
Due after five years through ten years 143,728,000   143,728,000    
Due after five years through ten years 36,906,000   36,906,000    
Due after five years through ten years 35,677,000   35,677,000    
Due after ten years 2,056,683,000   2,056,683,000    
Due after ten years 1,751,462,000   1,751,462,000    
Due after ten years 234,279,000   234,279,000    
Due after ten years 223,000,000   223,000,000    
Total 271,185,000   271,185,000    
Total 258,677,000   258,677,000    
Available-for-sale Securities          
Debt Securities, Available-for-sale [Line Items]          
Unrealized gains on securities available for sale net of taxes (230,800,000)   (230,800,000)   (13,000,000)
Collateralized mortgage obligations          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost 974,052,000   974,052,000   1,039,543,000
Gross Unrealized Gains 9,000   9,000   3,357,000
Gross Unrealized Losses (149,734,000)   (149,734,000)   (16,470,000)
Fair Value 824,327,000   824,327,000   1,026,430,000
Mortgage-backed securities: Residential          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost 555,997,000   555,997,000   769,113,000
Gross Unrealized Gains 0   0   1,985,000
Gross Unrealized Losses (99,407,000)   (99,407,000)   (11,874,000)
Fair Value 456,590,000   456,590,000   759,224,000
Debt Securities, Held-to-maturity, Fair Value 151,698,000   151,698,000    
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss 7,840,000   7,840,000    
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0   0    
Investment securities held to maturity, at amortized cost; fair value of $258,677 and $0 at September 30, 2022 and December 31, 2021, respectively 159,538,000   159,538,000    
Mortgage-backed securities: Commercial          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost 426,483,000   426,483,000   595,659,000
Gross Unrealized Gains 0   0   9,103,000
Gross Unrealized Losses (46,868,000)   (46,868,000)   (5,360,000)
Fair Value 379,615,000   379,615,000   599,402,000
Debt Securities, Held-to-maturity, Fair Value 106,979,000   106,979,000    
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss 4,668,000   4,668,000    
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0   0    
Investment securities held to maturity, at amortized cost; fair value of $258,677 and $0 at September 30, 2022 and December 31, 2021, respectively 111,647,000   111,647,000    
Corporate securities          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost 23,362,000   23,362,000   23,398,000
Gross Unrealized Gains 0   0   130,000
Gross Unrealized Losses (4,647,000)   (4,647,000)   (1,044,000)
Fair Value 18,715,000   18,715,000   22,484,000
Municipal securities          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost 180,265,000   180,265,000   104,371,000
Gross Unrealized Gains 0   0   1,680,000
Gross Unrealized Losses (17,831,000)   (17,831,000)   (767,000)
Fair Value 162,434,000   $ 162,434,000   $ 105,284,000
Non-US Government and Agency Securities | Credit concentration risk | Stockholders' equity          
Debt Securities, Available-for-sale [Line Items]          
Maximum exposure to any single issuer     10.00%   10.00%
Asset-backed Securities          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost 153,548,000   $ 153,548,000   $ 153,564,000
Gross Unrealized Gains 0   0   11,000
Gross Unrealized Losses (9,645,000)   (9,645,000)   (124,000)
Fair Value 143,903,000   143,903,000   $ 153,451,000
US Treasury Notes Securities          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost 3,988,000   3,988,000    
Gross Unrealized Gains 0   0    
Gross Unrealized Losses (99,000)   (99,000)    
Fair Value 3,889,000   3,889,000    
Agency Securities          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost 4,000,000   4,000,000    
Gross Unrealized Gains 0   0    
Gross Unrealized Losses (125,000)   (125,000)    
Fair Value $ 3,875,000   $ 3,875,000