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FAIR VALUE MEASUREMENTS - Measured on Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading security $ 6,800 $ 8,400
Securities available for sale, at fair value 1,470,949 1,877,585
Marketable equity securities 12,790 15,453
U.S Treasuries    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at fair value 20,000 59,973
Municipal bonds and obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at fair value 60,566 77,177
Corporate bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at fair value 42,901 45,660
Other bonds and obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at fair value 656  
Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading security 6,812 8,354
Securities available for sale, at fair value 1,470,949 1,877,585
Marketable equity securities 12,790 15,453
Loans held for investment at fair value 7,798,562 6,850,975
Loans held for sale 4,124 6,110
Derivative assets 53,019 79,528
Derivative liabilities 101,745 35,194
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading security 0 0
Securities available for sale, at fair value 0 0
Marketable equity securities 12,790 14,798
Loans held for investment at fair value 0 0
Loans held for sale 0 0
Derivative assets 0 0
Derivative liabilities 0 0
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading security 0 0
Securities available for sale, at fair value 1,467,029 1,873,555
Marketable equity securities 0 655
Loans held for investment at fair value 0 0
Loans held for sale 550 6,110
Derivative assets 52,997 79,270
Derivative liabilities 101,745 35,194
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading security 6,812 8,354
Securities available for sale, at fair value 3,920 4,030
Marketable equity securities 0 0
Loans held for investment at fair value 7,798,562 6,850,975
Loans held for sale 3,574 0
Derivative assets 22 258
Derivative liabilities 0 0
Recurring | Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading security 6,812 8,354
Marketable equity securities 12,790 15,453
Loans held for investment at fair value 796 1,200
Loans held for sale 550 6,110
Derivative assets 53,019 79,528
Capitalized servicing rights 2,026 1,966
Derivative liabilities 101,745 35,194
Recurring | Fair Value | U.S Treasuries    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at fair value 20,000 59,973
Recurring | Fair Value | Municipal bonds and obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at fair value 60,566 77,177
Recurring | Fair Value | Agency collateralized mortgage obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at fair value 557,513 688,336
Recurring | Fair Value | Agency residential mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at fair value 553,737 705,859
Recurring | Fair Value | Agency commercial mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at fair value 235,576 300,580
Recurring | Fair Value | Corporate bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at fair value 42,901 45,660
Recurring | Fair Value | Other bonds and obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at fair value 656  
Recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading security 0 0
Marketable equity securities 12,790 14,798
Loans held for investment at fair value 0 0
Loans held for sale 0 0
Derivative assets 0 0
Capitalized servicing rights 0 0
Derivative liabilities 0 0
Recurring | Level 1 | U.S Treasuries    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at fair value 0 0
Recurring | Level 1 | Municipal bonds and obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at fair value 0 0
Recurring | Level 1 | Agency collateralized mortgage obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at fair value 0 0
Recurring | Level 1 | Agency residential mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at fair value 0 0
Recurring | Level 1 | Agency commercial mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at fair value 0 0
Recurring | Level 1 | Corporate bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at fair value 0 0
Recurring | Level 1 | Other bonds and obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at fair value 0  
Recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading security 0 0
Marketable equity securities 0 655
Loans held for investment at fair value 0 0
Loans held for sale 550 6,110
Derivative assets 52,997 79,270
Capitalized servicing rights 0 0
Derivative liabilities 101,745 35,194
Recurring | Level 2 | U.S Treasuries    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at fair value 20,000 59,973
Recurring | Level 2 | Municipal bonds and obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at fair value 60,566 77,177
Recurring | Level 2 | Agency collateralized mortgage obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at fair value 557,513 688,336
Recurring | Level 2 | Agency residential mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at fair value 553,737 705,859
Recurring | Level 2 | Agency commercial mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at fair value 235,576 300,580
Recurring | Level 2 | Corporate bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at fair value 38,981 41,630
Recurring | Level 2 | Other bonds and obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at fair value 656  
Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading security 6,812 8,354
Securities available for sale, at fair value   4,030
Marketable equity securities 0 0
Loans held for investment at fair value 796 1,200
Loans held for sale 0 0
Derivative assets 22 258
Capitalized servicing rights 2,026 1,966
Derivative liabilities 0 0
Recurring | Level 3 | U.S Treasuries    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at fair value 0 0
Recurring | Level 3 | Municipal bonds and obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at fair value 0 0
Recurring | Level 3 | Agency collateralized mortgage obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at fair value 0 0
Recurring | Level 3 | Agency residential mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at fair value 0 0
Recurring | Level 3 | Agency commercial mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at fair value 0 0
Recurring | Level 3 | Corporate bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at fair value 3,920 $ 4,030
Recurring | Level 3 | Other bonds and obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at fair value $ 0