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Fair Value Measurements (Details 2) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
ASSETS    
Debt Securities, Held-to-maturity $ 1,408,189 $ 1,066,818
Held to Maturity, Fair Value, Total 1,297,165 1,064,133
Loans, net of allowance for credit losses (b) 13,531,445 13,440,364
Federal Home Loan Bank Stock 6,249 11,407
Bank Owned Life Insurance 292,807 289,304
LIABILITIES    
Federal Home Loan Bank borrowings (f) 25,652 25,667
Long-term Debt [1]   14,063
Long-term Debt, Fair Value [1]   13,989
Subordinated Debt 49,838 49,791
Deposits [Member]    
LIABILITIES    
Time certificates of deposits (f) [2] 15,328,945 15,385,894
Accrued Liabilities, Fair Value Disclosure [2] 15,328,945 15,385,894
Time certificates of deposits (f)    
LIABILITIES    
Time certificates of deposits (f) [1] 1,310,603 1,531,150
Accrued Liabilities, Fair Value Disclosure [1] 1,287,031 1,529,857
Federal Home Loan Bank borrowings (f)    
LIABILITIES    
Federal Home Loan Bank borrowings (f) [1] 25,652 25,667
Federal Home Loan Bank Borrowings, Fair Value Disclosure [1] 25,577 25,663
Junior subordinated debentures (g)    
LIABILITIES    
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust [3] 62,854 62,853
Accrued Liabilities, Fair Value Disclosure [3] 61,704 67,019
Subordinated debentures (f)    
LIABILITIES    
Subordinated Debt [1] 49,838 49,791
Accrued Liabilities, Fair Value Disclosure [1] 44,172 45,532
Quoted Prices in Active Markets for Identical Assets (Level 1) | Long-term Debt [Member]    
LIABILITIES    
Long-term Debt, Fair Value [1]   0
Significant Other Observable Inputs (Level 2) | Deposits [Member]    
LIABILITIES    
Accrued Liabilities, Fair Value Disclosure [2] 15,328,945 15,385,894
Significant Other Observable Inputs (Level 2) | Time certificates of deposits (f)    
LIABILITIES    
Accrued Liabilities, Fair Value Disclosure [1] 1,287,031 1,529,857
Significant Other Observable Inputs (Level 2) | Federal Home Loan Bank borrowings (f)    
LIABILITIES    
Federal Home Loan Bank Borrowings, Fair Value Disclosure [1] 25,577 25,663
Significant Other Observable Inputs (Level 2) | Long-term Debt [Member]    
LIABILITIES    
Long-term Debt, Fair Value [1]   13,989
Significant Other Observable Inputs (Level 2) | Junior subordinated debentures (g)    
LIABILITIES    
Accrued Liabilities, Fair Value Disclosure [3] 61,704 67,019
Significant Unobservable Inputs (Level 3) | Long-term Debt [Member]    
LIABILITIES    
Long-term Debt, Fair Value [1]   0
Significant Unobservable Inputs (Level 3) | Subordinated debentures (f)    
LIABILITIES    
Accrued Liabilities, Fair Value Disclosure [1] 44,172 45,532
U.S. Government agency securities    
ASSETS    
Debt Securities, Held-to-maturity 32,128 32,987 [4]
Held to Maturity, Fair Value, Total 30,300 32,546 [4]
U.S. Government agency securities | Significant Other Observable Inputs (Level 2)    
ASSETS    
Held to Maturity, Fair Value, Total 30,300 32,546 [4]
U.S. treasury securities    
ASSETS    
Debt Securities, Held-to-maturity [4] 100,595 102,560
Held to Maturity, Fair Value, Total [4] 91,987 102,242
U.S. treasury securities | Significant Other Observable Inputs (Level 2)    
ASSETS    
Held to Maturity, Fair Value, Total [4] 91,987 102,242
Agency mortgage-backed securities    
ASSETS    
Debt Securities, Held-to-maturity [4] 631,754 493,012
Held to Maturity, Fair Value, Total [4] 584,074 497,236
Agency mortgage-backed securities | Significant Other Observable Inputs (Level 2)    
ASSETS    
Held to Maturity, Fair Value, Total [4] 584,074 497,236
Agency collateralized mortgage obligations    
ASSETS    
Debt Securities, Held-to-maturity [4] 577,183 415,736
Held to Maturity, Fair Value, Total [4] 524,994 408,845
Agency collateralized mortgage obligations | Significant Other Observable Inputs (Level 2)    
ASSETS    
Held to Maturity, Fair Value, Total [4] 524,994 408,845
Single issuer trust preferred securities issued by banks    
ASSETS    
Debt Securities, Held-to-maturity [4] 1,500 1,500
Held to Maturity, Fair Value, Total [4] 1,508 1,508
Single issuer trust preferred securities issued by banks | Significant Other Observable Inputs (Level 2)    
ASSETS    
Held to Maturity, Fair Value, Total [4] 1,508 1,508
Small Business Administration Pooled Securities [Member]    
ASSETS    
Debt Securities, Held-to-maturity [4] 65,029 21,023
Held to Maturity, Fair Value, Total [4] 64,302 21,756
Small Business Administration Pooled Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)    
ASSETS    
Held to Maturity, Fair Value, Total [4] 0 0
Small Business Administration Pooled Securities [Member] | Significant Other Observable Inputs (Level 2)    
ASSETS    
Held to Maturity, Fair Value, Total [4] 64,302 21,756
Small Business Administration Pooled Securities [Member] | Significant Unobservable Inputs (Level 3)    
ASSETS    
Held to Maturity, Fair Value, Total [4] 0 0
Loans, net of allowance for credit losses (b)    
ASSETS    
Loans, net of allowance for credit losses (b) [5] 13,506,796 13,439,190
Loans Receivable, Fair Value Disclosure [5] 13,351,014 13,389,515
Loans, net of allowance for credit losses (b) | Significant Unobservable Inputs (Level 3)    
ASSETS    
Loans Receivable, Fair Value Disclosure [5] 13,351,014 13,389,515
Investment in Federal Home Loan Bank Stock [Member]    
ASSETS    
Federal Home Loan Bank Stock [6] 6,249 11,407
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure [6] 6,249 11,407
Investment in Federal Home Loan Bank Stock [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)    
ASSETS    
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure [6] 0 0
Investment in Federal Home Loan Bank Stock [Member] | Significant Other Observable Inputs (Level 2)    
ASSETS    
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure [6] 6,249 11,407
Investment in Federal Home Loan Bank Stock [Member] | Significant Unobservable Inputs (Level 3)    
ASSETS    
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure [6] 0 0
Cash Surrender Value [Member]    
ASSETS    
Cash Surrender Value, Fair Value Disclosure [7] 292,807 289,304
Bank Owned Life Insurance [7] 292,807 289,304
Cash Surrender Value [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)    
ASSETS    
Cash Surrender Value, Fair Value Disclosure [7] 0 0
Cash Surrender Value [Member] | Significant Other Observable Inputs (Level 2)    
ASSETS    
Cash Surrender Value, Fair Value Disclosure [7] 292,807 289,304
Cash Surrender Value [Member] | Significant Unobservable Inputs (Level 3)    
ASSETS    
Cash Surrender Value, Fair Value Disclosure [7] $ 0 $ 0
[1] Fair value was determined by discounting anticipated future cash payments using rates currently available for instruments with similar remaining maturities.
[2] Fair value of demand deposits, savings and interest checking accounts and money market deposits is the amount payable on demand at the reporting date.
[3] Fair value was determined based upon market prices of securities with similar terms and maturities.
[4] The fair values presented are based on quoted market prices, where available. If quoted market prices are not available, fair values are based on quoted market prices of comparable instruments and/or discounted cash flow analysis.
[5] Fair value of loans is measured using the exit price valuation method, determined primarily by discounting the future cash flows using the current rates at which similar loans would be made to borrowers with similar credit ratings and for the same remaining maturities or cash flows, while incorporating liquidity and credit assumptions. Additionally, this amount excludes individually assessed collateral dependent loans, which are deemed to be marked to fair value on a nonrecurring basis.
[6] Federal Home Loan Bank stock has no quoted market value and is carried at cost; therefore the carrying amount approximates fair value.
[7] Cash surrender value of life insurance policies is recorded at its cash surrender value (or the amount that can be realized upon surrender of the policy), therefore, carrying amount approximates fair value.