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Fair Value of Financial Instruments - Schedule of Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
ASSETS:    
Cash and cash equivalents $ 369,705 $ 195,505
Investment securities available-for-sale (at fair value) 695,485 706,289
Investment securities held-to-maturity, fair value 555,256 559,924
Mortgage-backed securities-residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity 637,921 651,527
Loans receivable 7,254,955 7,130,916
Capital stock of FHLB 45,600 20,300
Total Loans 7,345,298 7,220,469
Loans held-for-sale 24,594 22,767
Accrued interest receivable 36,100 31,800
LIABILITIES:    
Time deposits 978,489 873,400
Securities sold under agreements to repurchase 21,492 20,214
Long-term debt 53,968 53,890
Federal Home Loan Bank advances 1,000,000 385,000
U.S. Treasury Securities [Member]    
ASSETS:    
Investment securities available-for-sale (at fair value) 72,154 71,388
Investment securities held-to-maturity, fair value 48,141 47,629
Mortgage-backed securities-residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity 49,117 49,045
Residential Mortgage Pass-Through Securities Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member].    
ASSETS:    
Investment securities available-for-sale (at fair value) 222,209 226,131
Investment securities held-to-maturity, fair value 295,246 298,816
Mortgage-backed securities-residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity 331,996 339,815
Other Residential MBS Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]    
ASSETS:    
Investment securities available-for-sale (at fair value) 398,282 405,926
Investment securities held-to-maturity, fair value 211,869 213,479
Mortgage-backed securities-residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity 256,808 262,667
Other Securities [Member]    
ASSETS:    
Investment securities available-for-sale (at fair value) 794 771
Municipal Securities [Member]    
ASSETS:    
Investment securities available-for-sale (at fair value) 154 153
Corporate Debt Securities [Member]    
ASSETS:    
Investment securities available-for-sale (at fair value) 1,892 1,920
Carrying Amount [Member] | Level 1 [Member]    
ASSETS:    
Cash and cash equivalents 369,705 195,505
Carrying Amount [Member] | Level 2 [Member]    
ASSETS:    
Non-marketable securities 69,319 38,390
Loans held-for-sale 24,594 22,767
Accrued interest receivable 39,608 34,587
LIABILITIES:    
Deposit transaction accounts 6,603,191 6,999,226
Time deposits 978,489 873,400
Securities sold under agreements to repurchase 21,492 20,214
Long-term debt 55,000 55,000
Federal Home Loan Bank advances 1,000,000 385,000
Accrued interest payable 6,498 3,201
Carrying Amount [Member] | Level 3 [Member]    
ASSETS:    
Total Loans 7,345,298 7,220,469
Carrying Amount [Member] | U.S. Treasury Securities [Member] | Level 1 [Member]    
ASSETS:    
Investment securities available-for-sale (at fair value) 72,154 71,388
Investment securities held-to-maturity, fair value 49,117 49,045
Carrying Amount [Member] | Residential Mortgage Pass-Through Securities Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]. | Level 2 [Member]    
ASSETS:    
Investment securities available-for-sale (at fair value) 222,209 226,131
Mortgage-backed securities-residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity 331,996 339,815
Carrying Amount [Member] | Other Residential MBS Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member] | Level 2 [Member]    
ASSETS:    
Investment securities available-for-sale (at fair value) 398,282 405,926
Mortgage-backed securities-residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity 256,808 262,667
Carrying Amount [Member] | Other Securities [Member] | Level 3 [Member]    
ASSETS:    
Investment securities available-for-sale (at fair value) 794 771
Carrying Amount [Member] | Municipal Securities [Member] | Level 2 [Member]    
ASSETS:    
Municipal obligations 154 153
Carrying Amount [Member] | Corporate Debt Securities [Member] | Level 2 [Member]    
ASSETS:    
Investment securities available-for-sale (at fair value) 1,892 1,920
Estimated Fair Value [Member] | Level 1 [Member]    
ASSETS:    
Cash and cash equivalents 369,705 195,505
Estimated Fair Value [Member] | Level 2 [Member]    
ASSETS:    
Non-marketable securities 69,319 38,390
Loans held-for-sale 24,594 22,767
Accrued interest receivable 39,608 34,587
LIABILITIES:    
Deposit transaction accounts 6,603,191 6,999,226
Time deposits 953,790 845,688
Securities sold under agreements to repurchase 21,492 20,214
Long-term debt 49,421 52,430
Federal Home Loan Bank advances 1,000,000 385,000
Accrued interest payable 6,498 3,201
Estimated Fair Value [Member] | Level 3 [Member]    
ASSETS:    
Total Loans 7,090,982 6,964,107
Estimated Fair Value [Member] | U.S. Treasury Securities [Member] | Level 1 [Member]    
ASSETS:    
Investment securities available-for-sale (at fair value) 72,154 71,388
Investment securities held-to-maturity, fair value 48,141 47,629
Estimated Fair Value [Member] | Residential Mortgage Pass-Through Securities Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]. | Level 2 [Member]    
ASSETS:    
Investment securities available-for-sale (at fair value) 222,209 226,131
Mortgage-backed securities-residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity 295,246 298,816
Estimated Fair Value [Member] | Other Residential MBS Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member] | Level 2 [Member]    
ASSETS:    
Investment securities available-for-sale (at fair value) 398,282 405,926
Mortgage-backed securities-residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity 211,869 213,479
Estimated Fair Value [Member] | Other Securities [Member] | Level 3 [Member]    
ASSETS:    
Investment securities available-for-sale (at fair value) 794 771
Estimated Fair Value [Member] | Municipal Securities [Member] | Level 2 [Member]    
ASSETS:    
Municipal obligations 154 153
Estimated Fair Value [Member] | Corporate Debt Securities [Member] | Level 2 [Member]    
ASSETS:    
Investment securities available-for-sale (at fair value) 1,892 1,920
Interest Rate Swap [Member] | Carrying Amount [Member] | Level 2 [Member]    
ASSETS:    
Derivative asset $ 34,088 $ 45,046
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other Assets Other Assets
LIABILITIES:    
Derivative liability $ 10,042 $ 12,589
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Other Liabilities. Other Liabilities.
Interest Rate Swap [Member] | Estimated Fair Value [Member] | Level 2 [Member]    
ASSETS:    
Derivative asset $ 34,088 $ 45,046
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other Assets Other Assets
LIABILITIES:    
Derivative liability $ 10,042 $ 12,589
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Other Liabilities. Other Liabilities.
Mortgage banking derivatives | Carrying Amount [Member] | Level 3 [Member]    
ASSETS:    
Derivative asset $ 707 $ 407
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other Assets Other Assets
LIABILITIES:    
Derivative liability $ 318 $ 278
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Other Liabilities. Other Liabilities.
Mortgage banking derivatives | Estimated Fair Value [Member] | Level 3 [Member]    
ASSETS:    
Derivative asset $ 707 $ 407
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other Assets Other Assets
LIABILITIES:    
Derivative liability $ 318 $ 278
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Other Liabilities. Other Liabilities.