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FAIR VALUE OF FINANCIAL INSTRUMENTS (Fair Value By Balance Sheet Location) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Assets:    
Securities—trading $ 25,039 $ 24,980
Securities—available-for-sale 2,989,760 2,322,593
Securities—held-to-maturity 459,595 448,681
Liabilities:    
FHLB advances at fair value 100,000 150,000
Subordinated notes, net 98,290 98,201
Carrying Value    
Assets:    
Cash and cash equivalents 1,649,927 1,234,183
Securities—trading 25,039 24,980
Securities—available-for-sale 2,989,760 2,322,593
Loans receivable held for sale 135,263 243,795
Loans receivable 9,947,697 9,870,982
FHLB stock 14,001 16,358
Bank-owned life insurance 191,388 191,830
Mortgage servicing rights 15,407 15,223
Liabilities:    
Demand, interest checking and money market accounts 10,044,158 9,253,494
Regular savings 2,597,731 2,398,482
Certificates of deposit 906,978 915,320
FHLB advances at fair value 100,000 150,000
Other borrowings 216,260 184,785
Subordinated notes, net   98,201
Junior subordinated debentures at fair value 117,248 116,974
Estimated Fair Value    
Assets:    
Cash and cash equivalents 1,649,927 1,234,183
Securities—trading 25,039 24,980
Securities—available-for-sale 2,989,760 2,322,593
Loans receivable held for sale 136,873 245,667
Loans receivable 9,967,242 9,810,293
FHLB stock 14,001 16,358
Bank-owned life insurance 191,388 191,830
Mortgage servicing rights 21,176 18,084
Liabilities:    
Demand, interest checking and money market accounts 10,044,158 9,253,494
Regular savings 2,597,731 2,398,482
Certificates of deposit 910,069 919,920
FHLB advances at fair value 101,908 152,779
Other borrowings 216,260 184,785
Subordinated notes, net 98,290 98,201
Junior subordinated debentures at fair value 117,248 116,974
Interest rate swaps [Member] | Carrying Value    
Assets:    
Derivatives: 25,246 39,066
Liabilities:    
Derivatives: 17,923 22,336
Interest rate swaps [Member] | Estimated Fair Value    
Assets:    
Derivatives: 25,246 39,066
Liabilities:    
Derivatives: 17,923 22,336
Interest Rate Forward Sales Commitments [Member] | Carrying Value    
Assets:    
Derivatives: 6,186 5,641
Liabilities:    
Derivatives: 85 1,755
Interest Rate Forward Sales Commitments [Member] | Estimated Fair Value    
Assets:    
Derivatives: 6,186 5,641
Liabilities:    
Derivatives: 85 1,755
Fair Value, Inputs, Level 2 [Member] | Carrying Value    
Assets:    
Securities—held-to-maturity 418,871 410,038
Fair Value, Inputs, Level 2 [Member] | Estimated Fair Value    
Assets:    
Securities—held-to-maturity 436,484 436,882
Fair Value, Inputs, Level 3 [Member] | Carrying Value    
Assets:    
Securities—held-to-maturity 23,084 11,769
Fair Value, Inputs, Level 3 [Member] | Estimated Fair Value    
Assets:    
Securities—held-to-maturity $ 23,111 $ 11,799