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Fair value disclosure only table (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Assets, Fair Value Disclosure [Abstract]    
Debt Securities, Held-to-maturity $ 1,066,818 $ 724,512
Loans and Leases Receivable, Net Amount 13,440,364 9,279,474
Securities held to maturity, fair value 1,064,133 752,177
Federal Home Loan Bank Stock 11,407 10,250
Bank Owned Life Insurance 289,304 200,525
Liabilities, Fair Value Disclosure [Abstract]    
Advances from Federal Home Loan Banks 25,667 35,740
Subordinated Debt 49,791 49,696
Deposits [Member]    
Liabilities, Fair Value Disclosure [Abstract]    
Financial Liabilities Book Value 15,385,894 10,042,541
Accrued Liabilities, Fair Value Disclosure [1] 15,385,894 10,042,541
Bank Time Deposits [Member]    
Liabilities, Fair Value Disclosure [Abstract]    
Financial Liabilities Book Value 1,531,150 950,629
Accrued Liabilities, Fair Value Disclosure [2] 1,529,857 955,598
Federal Home Loan Bank Advances [Member]    
Liabilities, Fair Value Disclosure [Abstract]    
Advances from Federal Home Loan Banks 25,667 35,740
Federal Home Loan Bank Borrowings, Fair Value Disclosure [2] 25,663 35,885
Junior Subordinated Debt [Member]    
Liabilities, Fair Value Disclosure [Abstract]    
Junior subordinated debentures (less unamortized debt issuance costs of $35 and $37) 62,853 62,851
Accrued Liabilities, Fair Value Disclosure [3] 67,019 70,238
Subordinated Debt [Member]    
Liabilities, Fair Value Disclosure [Abstract]    
Subordinated Debt 49,791 49,696
Accrued Liabilities, Fair Value Disclosure [2] 45,532 46,486
Long-term Debt [Member]    
Liabilities, Fair Value Disclosure [Abstract]    
Long-term Debt 14,063 32,773
Long-term Debt, Fair Value [2] 13,989 32,033
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Long-term Debt [Member]    
Liabilities, Fair Value Disclosure [Abstract]    
Long-term Debt, Fair Value 0 0
Significant Other Observable Inputs (Level 2) [Member] | Deposits [Member]    
Liabilities, Fair Value Disclosure [Abstract]    
Accrued Liabilities, Fair Value Disclosure 15,385,894 10,042,541
Significant Other Observable Inputs (Level 2) [Member] | Bank Time Deposits [Member]    
Liabilities, Fair Value Disclosure [Abstract]    
Accrued Liabilities, Fair Value Disclosure 1,529,857 955,598
Significant Other Observable Inputs (Level 2) [Member] | Federal Home Loan Bank Advances [Member]    
Liabilities, Fair Value Disclosure [Abstract]    
Federal Home Loan Bank Borrowings, Fair Value Disclosure 25,663  
Accrued Liabilities, Fair Value Disclosure   35,885
Significant Other Observable Inputs (Level 2) [Member] | Junior Subordinated Debt [Member]    
Liabilities, Fair Value Disclosure [Abstract]    
Accrued Liabilities, Fair Value Disclosure 67,019 70,238
Significant Other Observable Inputs (Level 2) [Member] | Long-term Debt [Member]    
Liabilities, Fair Value Disclosure [Abstract]    
Long-term Debt, Fair Value 13,989 32,033
Significant Unobservable Inputs (Level 3) [Member] | Subordinated Debt [Member]    
Liabilities, Fair Value Disclosure [Abstract]    
Accrued Liabilities, Fair Value Disclosure 45,532 46,486
Significant Unobservable Inputs (Level 3) [Member] | Long-term Debt [Member]    
Liabilities, Fair Value Disclosure [Abstract]    
Long-term Debt, Fair Value 0 0
US Government Agencies Debt Securities [Member]    
Assets, Fair Value Disclosure [Abstract]    
Debt Securities, Held-to-maturity 32,987  
Securities held to maturity, fair value 32,546  
US Government Agencies Debt Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Assets, Fair Value Disclosure [Abstract]    
Securities held to maturity, fair value 32,546  
US Treasury Securities [Member]    
Assets, Fair Value Disclosure [Abstract]    
Debt Securities, Held-to-maturity 102,560 4,017
Securities held to maturity, fair value [4] 102,242 4,077
US Treasury Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Assets, Fair Value Disclosure [Abstract]    
Securities held to maturity, fair value 102,242 4,077
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Assets, Fair Value Disclosure [Abstract]    
Debt Securities, Held-to-maturity 493,012 356,085
Securities held to maturity, fair value [4] 497,236 374,121
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Assets, Fair Value Disclosure [Abstract]    
Securities held to maturity, fair value 497,236 374,121
Collateralized Mortgage Obligations [Member]    
Assets, Fair Value Disclosure [Abstract]    
Debt Securities, Held-to-maturity 415,736 335,993
Securities held to maturity, fair value [4] 408,845 344,119
Collateralized Mortgage Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Assets, Fair Value Disclosure [Abstract]    
Securities held to maturity, fair value 408,845 344,119
Single Issuer Trust Preferred Securities Issued By Banks [Member]    
Assets, Fair Value Disclosure [Abstract]    
Debt Securities, Held-to-maturity 1,500 1,500
Securities held to maturity, fair value [4] 1,508 1,498
Single Issuer Trust Preferred Securities Issued By Banks [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Assets, Fair Value Disclosure [Abstract]    
Securities held to maturity, fair value 1,508 1,498
Small Business Administration Pooled Securities [Member]    
Assets, Fair Value Disclosure [Abstract]    
Debt Securities, Held-to-maturity 21,023 26,917
Securities held to maturity, fair value [4] 21,756 28,362
Small Business Administration Pooled Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Assets, Fair Value Disclosure [Abstract]    
Securities held to maturity, fair value 0 0
Small Business Administration Pooled Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Assets, Fair Value Disclosure [Abstract]    
Securities held to maturity, fair value 21,756 28,362
Small Business Administration Pooled Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Assets, Fair Value Disclosure [Abstract]    
Securities held to maturity, fair value 0 0
Loans Net Of Allowance For Loan Loses [Member]    
Assets, Fair Value Disclosure [Abstract]    
Loans and Leases Receivable, Net Amount 13,439,190 9,247,964
Loans, net of allowance for loan losses [5] 13,389,515 9,253,381
Loans Net Of Allowance For Loan Loses [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Assets, Fair Value Disclosure [Abstract]    
Loans, net of allowance for loan losses 13,389,515 9,253,381
Investment in Federal Home Loan Bank Stock [Member]    
Assets, Fair Value Disclosure [Abstract]    
Federal Home Loan Bank Stock 11,407 10,250
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure [6] 11,407 10,250
Investment in Federal Home Loan Bank Stock [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Assets, Fair Value Disclosure [Abstract]    
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure 0 0
Investment in Federal Home Loan Bank Stock [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Assets, Fair Value Disclosure [Abstract]    
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure 11,407 10,250
Investment in Federal Home Loan Bank Stock [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Assets, Fair Value Disclosure [Abstract]    
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure 0 0
Cash Surrender Value [Member]    
Assets, Fair Value Disclosure [Abstract]    
Bank Owned Life Insurance 289,304 200,525
Cash Surrender Value, Fair Value Disclosure [7] 289,304 200,525
Cash Surrender Value [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Assets, Fair Value Disclosure [Abstract]    
Cash Surrender Value, Fair Value Disclosure 0 0
Cash Surrender Value [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Assets, Fair Value Disclosure [Abstract]    
Cash Surrender Value, Fair Value Disclosure 289,304 200,525
Cash Surrender Value [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Assets, Fair Value Disclosure [Abstract]    
Cash Surrender Value, Fair Value Disclosure $ 0 $ 0
[1] Fair value of demand deposits, savings and interest checking accounts and money market deposits is the amount payable on demand at the reporting date.
[2] Fair value was determined by discounting anticipated future cash payments using rates currently available for instruments with similar remaining maturities.
[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 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.