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Fair Value Measurements - Carrying Value and Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total investment securities available for sale $ 852,779  
Financial Assets:    
Investment securities held to maturity 661,696 $ 662,450
Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total investment securities available for sale 0 0
Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total investment securities available for sale 852,779 1,134,353
Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total investment securities available for sale 0 0
Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total investment securities available for sale 852,779 1,134,353
Financial Assets:    
Cash and cash equivalents 175,572 224,973
Investment securities held to maturity 719,400 739,442
Loans receivable, net 4,628,088 4,287,628
Accrued interest receivable 20,102 19,518
Equity security 287 314
Financial Liabilities:    
Borrowings 382,000 500,000
Junior subordinated debentures 21,985 21,765
Accrued interest payable 3,909 13,026
Carrying Value | Interest Rate Derivative Contracts    
Financial Assets:    
Derivative assets - interest rate swaps 17,366 23,195
Financial Liabilities:    
Derivative liabilities - interest rate swaps 17,366 23,195
Carrying Value | Non-maturity deposits    
Financial Liabilities:    
Non-maturity deposits 4,762,932 4,906,899
Carrying Value | Certificates of deposit    
Financial Liabilities:    
Non-maturity deposits 945,560 692,973
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total investment securities available for sale 852,779 1,134,353
Financial Assets:    
Cash and cash equivalents 175,572 224,973
Investment securities held to maturity 661,696 662,450
Loans receivable, net 4,598,146 4,159,513
Accrued interest receivable 20,102 19,518
Equity security 287 314
Financial Liabilities:    
Borrowings 382,457 499,861
Junior subordinated debentures 19,677 19,750
Accrued interest payable 3,909 13,026
Fair Value | Interest Rate Derivative Contracts    
Financial Assets:    
Derivative assets - interest rate swaps 17,366 23,195
Financial Liabilities:    
Derivative liabilities - interest rate swaps 17,366 23,195
Fair Value | Non-maturity deposits    
Financial Liabilities:    
Non-maturity deposits 4,762,932 4,906,899
Fair Value | Certificates of deposit    
Financial Liabilities:    
Non-maturity deposits 956,950 701,029
Fair Value | Level 1    
Financial Assets:    
Cash and cash equivalents 175,572 224,973
Investment securities held to maturity 0 0
Loans receivable, net 0 0
Accrued interest receivable 209 96
Equity security 287 314
Financial Liabilities:    
Borrowings 0 0
Junior subordinated debentures 0 0
Accrued interest payable 58 63
Fair Value | Level 1 | Interest Rate Derivative Contracts    
Financial Assets:    
Derivative assets - interest rate swaps 0 0
Financial Liabilities:    
Derivative liabilities - interest rate swaps 0 0
Fair Value | Level 1 | Non-maturity deposits    
Financial Liabilities:    
Non-maturity deposits 4,762,932 4,906,899
Fair Value | Level 1 | Certificates of deposit    
Financial Liabilities:    
Non-maturity deposits 0 0
Fair Value | Level 2    
Financial Assets:    
Cash and cash equivalents 0 0
Investment securities held to maturity 661,696 662,450
Loans receivable, net 0 0
Accrued interest receivable 5,138 6,127
Equity security 0 0
Financial Liabilities:    
Borrowings 382,457 499,861
Junior subordinated debentures 0 0
Accrued interest payable 3,778 12,880
Fair Value | Level 2 | Interest Rate Derivative Contracts    
Financial Assets:    
Derivative assets - interest rate swaps 17,366 23,195
Financial Liabilities:    
Derivative liabilities - interest rate swaps 17,366 23,195
Fair Value | Level 2 | Non-maturity deposits    
Financial Liabilities:    
Non-maturity deposits 0 0
Fair Value | Level 2 | Certificates of deposit    
Financial Liabilities:    
Non-maturity deposits 956,950 701,029
Fair Value | Level 3    
Financial Assets:    
Cash and cash equivalents 0 0
Investment securities held to maturity 0 0
Loans receivable, net 4,598,146 4,159,513
Accrued interest receivable 14,755 13,295
Equity security 0 0
Financial Liabilities:    
Borrowings 0 0
Junior subordinated debentures 19,677 19,750
Accrued interest payable 73 83
Fair Value | Level 3 | Interest Rate Derivative Contracts    
Financial Assets:    
Derivative assets - interest rate swaps 0 0
Financial Liabilities:    
Derivative liabilities - interest rate swaps 0 0
Fair Value | Level 3 | Non-maturity deposits    
Financial Liabilities:    
Non-maturity deposits 0 0
Fair Value | Level 3 | Certificates of deposit    
Financial Liabilities:    
Non-maturity deposits $ 0 $ 0