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Loans Held for Investment and Allowance for Loan Losses (Details 3) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Allowance for Loan and Lease Losses [Roll Forward]    
Beginning balance $ 184,655 $ 168,126
Provision for loan losses 84,637 46,351
Charge-offs 80,778 34,674
Recoveries 3,008 4,852
Net charge-offs (recoveries) 77,770 29,822
Ending balance 191,522 184,655
Period end allowance for loan losses allocated to:    
Loans individually evaluated for impairment 8,310 24,417
Loans collectively evaluated for impairment 183,212 160,238
Period end loans allocated to:    
Loans individually evaluated for impairment 87,340 102,684
Loans collectively evaluated for impairment 22,589,184 20,669,659
Gross loans held for investment $ 22,676,524 $ 20,772,343
Additional qualitative reserve as percentage of loans held for investment 0.03% 0.04%
Commercial    
Allowance for Loan and Lease Losses [Roll Forward]    
Beginning balance $ 118,806 $ 128,768
Provision for loan losses 87,860 19,590
Charge-offs 79,692 34,145
Recoveries 2,468 4,593
Net charge-offs (recoveries) 77,224 29,552
Ending balance 129,442 118,806
Period end allowance for loan losses allocated to:    
Loans individually evaluated for impairment 8,252 24,316
Loans collectively evaluated for impairment 121,190 94,490
Period end loans allocated to:    
Loans individually evaluated for impairment 78,428 100,676
Loans collectively evaluated for impairment 10,294,860 9,089,135
Gross loans held for investment 10,373,288 9,189,811
Mortgage Finance    
Allowance for Loan and Lease Losses [Roll Forward]    
Beginning balance 0 0
Provision for loan losses 0 0
Charge-offs 0 0
Recoveries 0 0
Net charge-offs (recoveries) 0 0
Ending balance 0 0
Period end allowance for loan losses allocated to:    
Loans individually evaluated for impairment 0 0
Loans collectively evaluated for impairment 0 0
Period end loans allocated to:    
Loans individually evaluated for impairment 0 0
Loans collectively evaluated for impairment 5,877,524 5,308,160
Gross loans held for investment 5,877,524 5,308,160
Construction    
Allowance for Loan and Lease Losses [Roll Forward]    
Beginning balance 19,273 13,144
Provision for loan losses (31) 6,084
Charge-offs 0 59
Recoveries 0 104
Net charge-offs (recoveries) 0 (45)
Ending balance 19,242 19,273
Period end allowance for loan losses allocated to:    
Loans individually evaluated for impairment 0 0
Loans collectively evaluated for impairment 19,242 19,273
Period end loans allocated to:    
Loans individually evaluated for impairment 0 0
Loans collectively evaluated for impairment 2,120,966 2,166,208
Gross loans held for investment 2,120,966 2,166,208
Real Estate    
Allowance for Loan and Lease Losses [Roll Forward]    
Beginning balance 34,287 19,149
Provision for loan losses (1,003) 15,353
Charge-offs 0 290
Recoveries 69 75
Net charge-offs (recoveries) (69) 215
Ending balance 33,353 34,287
Period end allowance for loan losses allocated to:    
Loans individually evaluated for impairment 48 101
Loans collectively evaluated for impairment 33,305 34,186
Period end loans allocated to:    
Loans individually evaluated for impairment 8,857 2,008
Loans collectively evaluated for impairment 3,920,260 3,792,569
Gross loans held for investment 3,929,117 3,794,577
Consumer    
Allowance for Loan and Lease Losses [Roll Forward]    
Beginning balance 357 241
Provision for loan losses 397 226
Charge-offs 767 180
Recoveries 438 70
Net charge-offs (recoveries) 329 110
Ending balance 425 357
Period end allowance for loan losses allocated to:    
Loans individually evaluated for impairment 10 0
Loans collectively evaluated for impairment 415 357
Period end loans allocated to:    
Loans individually evaluated for impairment 55 0
Loans collectively evaluated for impairment 63,383 48,684
Gross loans held for investment 63,438 48,684
Equipment Leases    
Allowance for Loan and Lease Losses [Roll Forward]    
Beginning balance 3,542 1,124
Provision for loan losses (1,427) 2,408
Charge-offs 319 0
Recoveries 33 10
Net charge-offs (recoveries) 286 (10)
Ending balance 1,829 3,542
Period end allowance for loan losses allocated to:    
Loans individually evaluated for impairment 0 0
Loans collectively evaluated for impairment 1,829 3,542
Period end loans allocated to:    
Loans individually evaluated for impairment 0 0
Loans collectively evaluated for impairment 312,191 264,903
Gross loans held for investment 312,191 264,903
Additional Qualitative Reserve    
Allowance for Loan and Lease Losses [Roll Forward]    
Beginning balance 8,390 5,700
Provision for loan losses (1,159) 2,690
Charge-offs 0 0
Recoveries 0 0
Net charge-offs (recoveries) 0 0
Ending balance 7,231 8,390
Period end allowance for loan losses allocated to:    
Loans individually evaluated for impairment 0 0
Loans collectively evaluated for impairment 7,231 8,390
Period end loans allocated to:    
Loans individually evaluated for impairment 0 0
Loans collectively evaluated for impairment 0 0
Gross loans held for investment $ 0 $ 0