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FAIR VALUE OF FINANCIAL INSTRUMENTS (Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities—trading $ 25,039 $ 24,980    
Securities—available-for-sale 2,989,760 2,322,593    
Advances from FHLB 100,000 150,000    
Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities—available-for-sale 2,989,760 2,322,593    
Total assets 3,106,224 2,525,834    
Junior subordinated debentures net of unamortized deferred issuance costs at fair value 117,248 116,974    
Total liabilities 135,256 141,065    
Recurring [Member] | Interest rate lock and forward sale commitments [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative assets 6,186 39,066    
Derivative liabilities 85 22,336    
Recurring [Member] | Interest rate swaps [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative assets 25,246 5,641    
Derivative liabilities 17,923 1,755    
Recurring [Member] | U.S. Government and agency obligations [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities—available-for-sale 62,846 141,735    
Recurring [Member] | Municipal bonds        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities—available-for-sale 300,735 303,518    
Recurring [Member] | Corporate bonds        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities—available-for-sale 245,428 221,769    
Recurring [Member] | TPS and TRUP CDOs [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities—trading 25,039 24,980    
Recurring [Member] | Mortgage-backed securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities—available-for-sale 2,377,003 1,646,152    
Recurring [Member] | Asset-backed securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities—available-for-sale 3,748 9,419    
Recurring [Member] | Loans [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans Held-for-sale, Fair Value Disclosure 59,993 133,554    
Recurring [Member] | Level 1 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities—available-for-sale 0 0    
Total assets 0 0    
Junior subordinated debentures net of unamortized deferred issuance costs at fair value 0 0    
Total liabilities 0 0    
Recurring [Member] | Level 1 [Member] | Interest rate lock and forward sale commitments [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative assets 0 0    
Derivative liabilities 0 0    
Recurring [Member] | Level 1 [Member] | Interest rate swaps [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative assets 0 0    
Derivative liabilities 0 0    
Recurring [Member] | Level 1 [Member] | U.S. Government and agency obligations [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities—available-for-sale 0 0    
Recurring [Member] | Level 1 [Member] | Municipal bonds        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities—available-for-sale 0 0    
Recurring [Member] | Level 1 [Member] | Corporate bonds        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities—available-for-sale 0 0    
Recurring [Member] | Level 1 [Member] | TPS and TRUP CDOs [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities—trading 0 0    
Recurring [Member] | Level 1 [Member] | Mortgage-backed securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities—available-for-sale 0 0    
Recurring [Member] | Level 1 [Member] | Asset-backed securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities—available-for-sale 0 0    
Recurring [Member] | Level 1 [Member] | Loans [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans Held-for-sale, Fair Value Disclosure 0 0    
Recurring [Member] | Fair Value, Inputs, Level 2 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities—available-for-sale 2,989,760 2,322,593    
Total assets 3,078,248 2,495,633    
Junior subordinated debentures net of unamortized deferred issuance costs at fair value 0 0    
Total liabilities 18,008 24,091    
Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Interest rate lock and forward sale commitments [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative assets 3,249 39,066    
Derivative liabilities 85 22,336    
Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Interest rate swaps [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative assets 25,246 420    
Derivative liabilities 17,923 1,755    
Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | U.S. Government and agency obligations [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities—available-for-sale 62,846 141,735    
Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Municipal bonds        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities—available-for-sale 300,735 303,518    
Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate bonds        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities—available-for-sale 245,428 221,769    
Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | TPS and TRUP CDOs [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities—trading 0 0    
Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Mortgage-backed securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities—available-for-sale 2,377,003 1,646,152    
Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Asset-backed securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities—available-for-sale 3,748 9,419    
Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Loans [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans Held-for-sale, Fair Value Disclosure 59,993 133,554    
Recurring [Member] | Fair Value, Inputs, Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities—available-for-sale 0 0    
Total assets 27,976 30,201    
Junior subordinated debentures net of unamortized deferred issuance costs at fair value 117,248 116,974    
Total liabilities 117,248 116,974    
Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Interest rate lock and forward sale commitments [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative assets 2,937 0    
Derivative liabilities 0 0    
Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Interest rate swaps [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative assets 0 5,221 $ 2,517 $ 791
Derivative liabilities 0 0    
Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | U.S. Government and agency obligations [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities—available-for-sale 0 0    
Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Municipal bonds        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities—available-for-sale 0 0    
Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Corporate bonds        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities—available-for-sale 0 0    
Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | TPS and TRUP CDOs [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities—trading 25,039 24,980    
Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Mortgage-backed securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities—available-for-sale 0 0    
Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Asset-backed securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities—available-for-sale 0 0    
Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Loans [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans Held-for-sale, Fair Value Disclosure $ 0 $ 0