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FAIR VALUE DISCLOSURES - Estimated Fair Values And The Related Carrying Values Of Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Financial Assets:    
Cash and cash equivalents $ 475,024 $ 683,240
Securities available-for-sale (carried at fair value) 1,522,535 1,398,558
Securities available-for-sale (carried at fair value)   1,398,558
Real estate mortgages held-for-sale 2,270 7,634
Loans, net 4,169,000 4,144,000
Mortgage banking derivative 257 398
Interest rate swap derivative 19,485 14,309
Accrued interest receivable 19,448 17,674
Financial Liabilities:    
Certificates of deposit (817,622) (833,617)
All other deposits (5,006,360) (4,905,889)
Federal Home Loan Bank advances (61,200) (66,118)
Mortgage banking derivative (3) (2)
Interest rate swap derivative (19,499) (14,329)
Standby letters of credit (202) (272)
Accrued interest payable (2,303) (2,619)
Carrying Value    
Financial Assets:    
Cash and cash equivalents 475,024 683,240
Securities available-for-sale (carried at fair value) 1,522,535  
Securities available-for-sale (carried at fair value)   1,398,558
Real estate mortgages held-for-sale 2,234 7,470
Loans, net 4,286,188 4,220,068
Mortgage banking derivative 257 398
Interest rate swap derivative 19,485 14,309
Federal Reserve and Federal Home Loan Bank Stock 12,840 13,772
Accrued interest receivable 19,448 17,674
Financial Liabilities:    
Certificates of deposit (814,263) (829,518)
All other deposits (5,006,360) (4,905,889)
Federal Home Loan Bank advances (75,000) (75,000)
Mortgage banking derivative (3) (2)
Interest rate swap derivative (19,499) (14,329)
Standby letters of credit (202) (272)
Accrued interest payable (2,303) (2,619)
Level 1 | Estimated Fair Value    
Financial Assets:    
Cash and cash equivalents 473,561 681,286
Securities available-for-sale (carried at fair value) 2,246  
Securities available-for-sale (carried at fair value)   900
Real estate mortgages held-for-sale 0 0
Loans, net 0 0
Mortgage banking derivative 0 0
Interest rate swap derivative 0 0
Accrued interest receivable 0 0
Financial Liabilities:    
Certificates of deposit 0 0
All other deposits (5,006,360) (4,905,889)
Federal Home Loan Bank advances 0 0
Mortgage banking derivative 0 0
Interest rate swap derivative 0 0
Standby letters of credit 0 0
Accrued interest payable (88) (84)
Level 2 | Estimated Fair Value    
Financial Assets:    
Cash and cash equivalents 1,463 1,954
Securities available-for-sale (carried at fair value) 1,517,972  
Securities available-for-sale (carried at fair value)   1,395,615
Real estate mortgages held-for-sale 2,270 7,634
Loans, net 0 0
Mortgage banking derivative 257 398
Interest rate swap derivative 19,485 14,309
Accrued interest receivable 9,162 7,689
Financial Liabilities:    
Certificates of deposit (817,622) (833,617)
All other deposits 0 0
Federal Home Loan Bank advances (61,200) (66,118)
Mortgage banking derivative (3) (2)
Interest rate swap derivative (19,499) (14,329)
Standby letters of credit 0 0
Accrued interest payable (2,215) (2,535)
Level 3 | Estimated Fair Value    
Financial Assets:    
Cash and cash equivalents 0 0
Securities available-for-sale (carried at fair value) 2,317  
Securities available-for-sale (carried at fair value)   2,043
Real estate mortgages held-for-sale 0 0
Loans, net 4,169,000 4,144,000
Mortgage banking derivative 0 0
Interest rate swap derivative 0 0
Accrued interest receivable 10,286 9,985
Financial Liabilities:    
Certificates of deposit 0 0
All other deposits 0 0
Federal Home Loan Bank advances 0 0
Mortgage banking derivative 0 0
Interest rate swap derivative 0 0
Standby letters of credit (202) (272)
Accrued interest payable $ 0 $ 0