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Fair Value Measurements - Carrying Value and Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total investment securities available for sale $ 996,510  
Financial Assets:    
Investment securities held to maturity 649,001 $ 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 996,510 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 996,510 1,134,353
Financial Assets:    
Cash and cash equivalents 189,647 224,973
Investment securities held to maturity 734,006 739,442
Loans receivable, net 4,378,429 4,287,628
Accrued interest receivable 19,898 19,518
Equity security 312 314
Financial Liabilities:    
Borrowings 500,000 500,000
Junior subordinated debentures 21,838 21,765
Accrued interest payable 18,434 13,026
Carrying Value | Interest Rate Derivative Contracts    
Financial Assets:    
Derivative assets - interest rate swaps 26,837 23,195
Financial Liabilities:    
Derivative liabilities - interest rate swaps 26,837 23,195
Carrying Value | Non-maturity deposits    
Financial Liabilities:    
Non-maturity deposits 4,752,652 4,906,899
Carrying Value | Certificates of deposit    
Financial Liabilities:    
Non-maturity deposits 779,675 692,973
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total investment securities available for sale 996,510 1,134,353
Financial Assets:    
Cash and cash equivalents 189,647 224,973
Investment securities held to maturity 649,001 662,450
Loans receivable, net 4,266,910 4,159,513
Accrued interest receivable 19,898 19,518
Equity security 312 314
Financial Liabilities:    
Borrowings 499,269 499,861
Junior subordinated debentures 19,750 19,750
Accrued interest payable 18,434 13,026
Fair Value | Interest Rate Derivative Contracts    
Financial Assets:    
Derivative assets - interest rate swaps 26,837 23,195
Financial Liabilities:    
Derivative liabilities - interest rate swaps 26,837 23,195
Fair Value | Non-maturity deposits    
Financial Liabilities:    
Non-maturity deposits 4,752,652 4,906,899
Fair Value | Certificates of deposit    
Financial Liabilities:    
Non-maturity deposits 789,331 701,029
Fair Value | Level 1    
Financial Assets:    
Cash and cash equivalents 189,647 224,973
Investment securities held to maturity 0 0
Loans receivable, net 0 0
Accrued interest receivable 240 96
Equity security 312 314
Financial Liabilities:    
Borrowings 0 0
Junior subordinated debentures 0 0
Accrued interest payable 63 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 4,752,652 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 649,001 662,450
Loans receivable, net 0 0
Accrued interest receivable 5,812 6,127
Equity security 0 0
Financial Liabilities:    
Borrowings 499,269 499,861
Junior subordinated debentures 0 0
Accrued interest payable 18,284 12,880
Fair Value | Level 2 | Interest Rate Derivative Contracts    
Financial Assets:    
Derivative assets - interest rate swaps 26,837 23,195
Financial Liabilities:    
Derivative liabilities - interest rate swaps 26,837 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 789,331 701,029
Fair Value | Level 3    
Financial Assets:    
Cash and cash equivalents 0 0
Investment securities held to maturity 0 0
Loans receivable, net 4,266,910 4,159,513
Accrued interest receivable 13,846 13,295
Equity security 0 0
Financial Liabilities:    
Borrowings 0 0
Junior subordinated debentures 19,750 19,750
Accrued interest payable 87 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