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FAIR VALUE MEASUREMENT AND DISCLOSURE (Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Financial assets:    
Trading securities $ 4,335 $ 4,161
Available-for-sale securities, at fair value (book value of $1,443,800 and $1,078,474, respectively) 1,455,210 1,115,813
Loans held for sale 10,789 40,499
Financial liabilities:    
Debt Securities, Trading 4,335 4,161
Obligations of U.S. government-sponsored enterprises    
Financial assets:    
Available-for-sale securities, at fair value (book value of $1,443,800 and $1,078,474, respectively) 8,452  
Obligations of states and political subdivisions    
Financial assets:    
Available-for-sale securities, at fair value (book value of $1,443,800 and $1,078,474, respectively) 117,753 127,120
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises    
Financial assets:    
Available-for-sale securities, at fair value (book value of $1,443,800 and $1,078,474, respectively) 919,992 566,618
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises    
Financial assets:    
Available-for-sale securities, at fair value (book value of $1,443,800 and $1,078,474, respectively) 392,827 410,454
Fair Value, Measurements, Recurring    
Financial assets:    
Trading securities 4,335 4,161
Loans held for sale 10,826 41,557
Financial liabilities:    
Debt Securities, Trading 4,335 4,161
Fair Value, Measurements, Recurring | Obligations of U.S. government-sponsored enterprises    
Financial assets:    
Available-for-sale securities, at fair value (book value of $1,443,800 and $1,078,474, respectively) 8,452  
Fair Value, Measurements, Recurring | Obligations of states and political subdivisions    
Financial assets:    
Available-for-sale securities, at fair value (book value of $1,443,800 and $1,078,474, respectively) 117,753 127,120
Fair Value, Measurements, Recurring | Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises    
Financial assets:    
Available-for-sale securities, at fair value (book value of $1,443,800 and $1,078,474, respectively) 919,992 566,618
Fair Value, Measurements, Recurring | Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises    
Financial assets:    
Available-for-sale securities, at fair value (book value of $1,443,800 and $1,078,474, respectively) 392,827 410,454
Fair Value, Measurements, Recurring | Corporate Bond Securities [Member]    
Financial assets:    
Available-for-sale securities, at fair value (book value of $1,443,800 and $1,078,474, respectively) 16,186 11,621
Readily Available Market Prices (Level 1) | Fair Value, Measurements, Recurring    
Financial assets:    
Trading securities 4,335 4,161
Loans held for sale 0 0
Financial liabilities:    
Debt Securities, Trading 4,335 4,161
Readily Available Market Prices (Level 1) | Fair Value, Measurements, Recurring | Obligations of U.S. government-sponsored enterprises    
Financial assets:    
Available-for-sale securities, at fair value (book value of $1,443,800 and $1,078,474, respectively) 0  
Readily Available Market Prices (Level 1) | Fair Value, Measurements, Recurring | Obligations of states and political subdivisions    
Financial assets:    
Available-for-sale securities, at fair value (book value of $1,443,800 and $1,078,474, respectively) 0 0
Readily Available Market Prices (Level 1) | Fair Value, Measurements, Recurring | Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises    
Financial assets:    
Available-for-sale securities, at fair value (book value of $1,443,800 and $1,078,474, respectively) 0 0
Readily Available Market Prices (Level 1) | Fair Value, Measurements, Recurring | Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises    
Financial assets:    
Available-for-sale securities, at fair value (book value of $1,443,800 and $1,078,474, respectively) 0 0
Readily Available Market Prices (Level 1) | Fair Value, Measurements, Recurring | Corporate Bond Securities [Member]    
Financial assets:    
Available-for-sale securities, at fair value (book value of $1,443,800 and $1,078,474, respectively) 0 0
Observable Market Data (Level 2) | Fair Value, Measurements, Recurring    
Financial assets:    
Trading securities 0 0
Loans held for sale 10,826 41,557
Financial liabilities:    
Debt Securities, Trading 0 0
Observable Market Data (Level 2) | Fair Value, Measurements, Recurring | Obligations of U.S. government-sponsored enterprises    
Financial assets:    
Available-for-sale securities, at fair value (book value of $1,443,800 and $1,078,474, respectively) 8,452  
Observable Market Data (Level 2) | Fair Value, Measurements, Recurring | Obligations of states and political subdivisions    
Financial assets:    
Available-for-sale securities, at fair value (book value of $1,443,800 and $1,078,474, respectively) 117,753 127,120
Observable Market Data (Level 2) | Fair Value, Measurements, Recurring | Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises    
Financial assets:    
Available-for-sale securities, at fair value (book value of $1,443,800 and $1,078,474, respectively) 919,992 566,618
Observable Market Data (Level 2) | Fair Value, Measurements, Recurring | Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises    
Financial assets:    
Available-for-sale securities, at fair value (book value of $1,443,800 and $1,078,474, respectively) 392,827 410,454
Observable Market Data (Level 2) | Fair Value, Measurements, Recurring | Corporate Bond Securities [Member]    
Financial assets:    
Available-for-sale securities, at fair value (book value of $1,443,800 and $1,078,474, respectively) 16,186 11,621
Company Determined Fair Value (Level 3) | Fair Value, Measurements, Recurring    
Financial assets:    
Trading securities 0 0
Loans held for sale 0 0
Financial liabilities:    
Debt Securities, Trading 0 0
Company Determined Fair Value (Level 3) | Fair Value, Measurements, Recurring | Obligations of U.S. government-sponsored enterprises    
Financial assets:    
Available-for-sale securities, at fair value (book value of $1,443,800 and $1,078,474, respectively) 0  
Company Determined Fair Value (Level 3) | Fair Value, Measurements, Recurring | Obligations of states and political subdivisions    
Financial assets:    
Available-for-sale securities, at fair value (book value of $1,443,800 and $1,078,474, respectively) 0 0
Company Determined Fair Value (Level 3) | Fair Value, Measurements, Recurring | Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises    
Financial assets:    
Available-for-sale securities, at fair value (book value of $1,443,800 and $1,078,474, respectively) 0 0
Company Determined Fair Value (Level 3) | Fair Value, Measurements, Recurring | Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises    
Financial assets:    
Available-for-sale securities, at fair value (book value of $1,443,800 and $1,078,474, respectively) 0 0
Company Determined Fair Value (Level 3) | Fair Value, Measurements, Recurring | Corporate Bond Securities [Member]    
Financial assets:    
Available-for-sale securities, at fair value (book value of $1,443,800 and $1,078,474, respectively) 0 0
Interest Rate Lock Commitments [Member] | Fair Value, Measurements, Recurring    
Financial assets:    
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value 498 608
Financial liabilities:    
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value 116 248
Interest Rate Lock Commitments [Member] | Readily Available Market Prices (Level 1) | Fair Value, Measurements, Recurring    
Financial assets:    
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value 0 0
Financial liabilities:    
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value   0
Interest Rate Lock Commitments [Member] | Observable Market Data (Level 2) | Fair Value, Measurements, Recurring    
Financial assets:    
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value 498 608
Financial liabilities:    
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value 116 248
Interest Rate Lock Commitments [Member] | Company Determined Fair Value (Level 3) | Fair Value, Measurements, Recurring    
Financial assets:    
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value 0 0
Financial liabilities:    
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value 0 0
Forward delivery commitments | Fair Value, Measurements, Recurring    
Financial assets:    
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value 215 311
Financial liabilities:    
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value 22 196
Forward delivery commitments | Readily Available Market Prices (Level 1) | Fair Value, Measurements, Recurring    
Financial assets:    
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value 0 0
Financial liabilities:    
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value   0
Forward delivery commitments | Observable Market Data (Level 2) | Fair Value, Measurements, Recurring    
Financial assets:    
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value 215 311
Financial liabilities:    
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value 22 196
Forward delivery commitments | Company Determined Fair Value (Level 3) | Fair Value, Measurements, Recurring    
Financial assets:    
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value 0 0
Financial liabilities:    
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value 0 0
Customer loan swaps | Fair Value, Measurements, Recurring    
Financial assets:    
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value 24,045 39,627
Financial liabilities:    
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value 24,045 39,627
Customer loan swaps | Readily Available Market Prices (Level 1) | Fair Value, Measurements, Recurring    
Financial assets:    
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value 0 0
Financial liabilities:    
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value 0 0
Customer loan swaps | Observable Market Data (Level 2) | Fair Value, Measurements, Recurring    
Financial assets:    
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value 24,045 39,627
Financial liabilities:    
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value 24,045 39,627
Customer loan swaps | Company Determined Fair Value (Level 3) | Fair Value, Measurements, Recurring    
Financial assets:    
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value 0 0
Financial liabilities:    
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value 0 0
Interest rate contracts    
Financial assets:    
Fair Value 6,849 5,731
Financial liabilities:    
Derivative Liability 8,597 11,625
Interest rate contracts | Fair Value, Measurements, Recurring    
Financial assets:    
Fair Value 6,849 5,731
Financial liabilities:    
Derivative Liability 8,597 11,625
Interest rate contracts | Readily Available Market Prices (Level 1) | Fair Value, Measurements, Recurring    
Financial assets:    
Fair Value 0 0
Financial liabilities:    
Derivative Liability   0
Interest rate contracts | Observable Market Data (Level 2) | Fair Value, Measurements, Recurring    
Financial assets:    
Fair Value 6,849 5,731
Financial liabilities:    
Derivative Liability 8,597 11,625
Interest rate contracts | Company Determined Fair Value (Level 3) | Fair Value, Measurements, Recurring    
Financial assets:    
Fair Value 0 0
Financial liabilities:    
Derivative Liability $ 0 $ 0