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ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY - Aging Of The Amortized Cost In Past Due Loans (Details) $ in Thousands	Jun. 30, 2021 USD ($)
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	$ 4,353,709
Total Nonaccrual	10,709
Nonaccrual With No Allowance For Credit Loss	3,343
Total Accruing
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	4,343,000
Loans Not Past Due
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	4,353,020
30-89 Days Past Due
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	671
Greater than 89 Days Past Due and Accruing
Financing Receivable, Amortized Cost, Aging [Abstract]
Greater than 89 Days Past Due and Accruing	18
Commercial and industrial loans | Working capital lines of credit loans
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	616,499
Total Nonaccrual	614
Nonaccrual With No Allowance For Credit Loss	173
Commercial and industrial loans | Working capital lines of credit loans | Total Accruing
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	615,885
Commercial and industrial loans | Working capital lines of credit loans | Loans Not Past Due
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	616,499
Commercial and industrial loans | Working capital lines of credit loans | 30-89 Days Past Due
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	0
Commercial and industrial loans | Working capital lines of credit loans | Greater than 89 Days Past Due and Accruing
Financing Receivable, Amortized Cost, Aging [Abstract]
Greater than 89 Days Past Due and Accruing	0
Commercial and industrial loans | Non-working capital loans
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	879,755
Total Nonaccrual	4,803
Nonaccrual With No Allowance For Credit Loss	351
Commercial and industrial loans | Non-working capital loans | Total Accruing
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	874,952
Commercial and industrial loans | Non-working capital loans | Loans Not Past Due
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	879,755
Commercial and industrial loans | Non-working capital loans | 30-89 Days Past Due
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	0
Commercial and industrial loans | Non-working capital loans | Greater than 89 Days Past Due and Accruing
Financing Receivable, Amortized Cost, Aging [Abstract]
Greater than 89 Days Past Due and Accruing	0
Commercial real estate and multi-family residential loans | Construction and land development loans
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	401,208
Total Nonaccrual	0
Nonaccrual With No Allowance For Credit Loss	0
Commercial real estate and multi-family residential loans | Construction and land development loans | Total Accruing
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	401,208
Commercial real estate and multi-family residential loans | Construction and land development loans | Loans Not Past Due
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	401,208
Commercial real estate and multi-family residential loans | Construction and land development loans | 30-89 Days Past Due
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	0
Commercial real estate and multi-family residential loans | Construction and land development loans | Greater than 89 Days Past Due and Accruing
Financing Receivable, Amortized Cost, Aging [Abstract]
Greater than 89 Days Past Due and Accruing	0
Commercial real estate and multi-family residential loans | Owner occupied loans
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	672,470
Total Nonaccrual	4,329
Nonaccrual With No Allowance For Credit Loss	2,650
Commercial real estate and multi-family residential loans | Owner occupied loans | Total Accruing
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	668,141
Commercial real estate and multi-family residential loans | Owner occupied loans | Loans Not Past Due
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	672,470
Commercial real estate and multi-family residential loans | Owner occupied loans | 30-89 Days Past Due
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	0
Commercial real estate and multi-family residential loans | Owner occupied loans | Greater than 89 Days Past Due and Accruing
Financing Receivable, Amortized Cost, Aging [Abstract]
Greater than 89 Days Past Due and Accruing	0
Commercial real estate and multi-family residential loans | Nonowner occupied loans
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	605,511
Total Nonaccrual	0
Nonaccrual With No Allowance For Credit Loss	0
Commercial real estate and multi-family residential loans | Nonowner occupied loans | Total Accruing
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	605,511
Commercial real estate and multi-family residential loans | Nonowner occupied loans | Loans Not Past Due
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	605,511
Commercial real estate and multi-family residential loans | Nonowner occupied loans | 30-89 Days Past Due
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	0
Commercial real estate and multi-family residential loans | Nonowner occupied loans | Greater than 89 Days Past Due and Accruing
Financing Receivable, Amortized Cost, Aging [Abstract]
Greater than 89 Days Past Due and Accruing	0
Commercial real estate and multi-family residential loans | Multifamily loans
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	300,089
Total Nonaccrual	0
Nonaccrual With No Allowance For Credit Loss	0
Commercial real estate and multi-family residential loans | Multifamily loans | Total Accruing
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	300,089
Commercial real estate and multi-family residential loans | Multifamily loans | Loans Not Past Due
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	300,089
Commercial real estate and multi-family residential loans | Multifamily loans | 30-89 Days Past Due
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	0
Commercial real estate and multi-family residential loans | Multifamily loans | Greater than 89 Days Past Due and Accruing
Financing Receivable, Amortized Cost, Aging [Abstract]
Greater than 89 Days Past Due and Accruing	0
Agri-business and agricultural loans | Loans secured by farmland
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	167,269
Total Nonaccrual	145
Nonaccrual With No Allowance For Credit Loss	0
Agri-business and agricultural loans | Loans secured by farmland | Total Accruing
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	167,124
Agri-business and agricultural loans | Loans secured by farmland | Loans Not Past Due
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	167,269
Agri-business and agricultural loans | Loans secured by farmland | 30-89 Days Past Due
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	0
Agri-business and agricultural loans | Loans secured by farmland | Greater than 89 Days Past Due and Accruing
Financing Receivable, Amortized Cost, Aging [Abstract]
Greater than 89 Days Past Due and Accruing	0
Agri-business and agricultural loans | Loans for agricultural production
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	179,410
Total Nonaccrual	0
Nonaccrual With No Allowance For Credit Loss	0
Agri-business and agricultural loans | Loans for agricultural production | Total Accruing
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	179,410
Agri-business and agricultural loans | Loans for agricultural production | Loans Not Past Due
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	179,410
Agri-business and agricultural loans | Loans for agricultural production | 30-89 Days Past Due
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	0
Agri-business and agricultural loans | Loans for agricultural production | Greater than 89 Days Past Due and Accruing
Financing Receivable, Amortized Cost, Aging [Abstract]
Greater than 89 Days Past Due and Accruing	0
Agri-business and agricultural loans | Other commercial loans
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	85,261
Total Nonaccrual	0
Nonaccrual With No Allowance For Credit Loss	0
Agri-business and agricultural loans | Other commercial loans | Total Accruing
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	85,261
Agri-business and agricultural loans | Other commercial loans | Loans Not Past Due
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	85,261
Agri-business and agricultural loans | Other commercial loans | 30-89 Days Past Due
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	0
Agri-business and agricultural loans | Other commercial loans | Greater than 89 Days Past Due and Accruing
Financing Receivable, Amortized Cost, Aging [Abstract]
Greater than 89 Days Past Due and Accruing	0
Consumer 1-4 family loans | Closed end first mortgage loans
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	169,355
Total Nonaccrual	467
Nonaccrual With No Allowance For Credit Loss	71
Consumer 1-4 family loans | Closed end first mortgage loans | Total Accruing
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	168,888
Consumer 1-4 family loans | Closed end first mortgage loans | Loans Not Past Due
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	168,793
Consumer 1-4 family loans | Closed end first mortgage loans | 30-89 Days Past Due
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	544
Consumer 1-4 family loans | Closed end first mortgage loans | Greater than 89 Days Past Due and Accruing
Financing Receivable, Amortized Cost, Aging [Abstract]
Greater than 89 Days Past Due and Accruing	18
Consumer 1-4 family loans | Open end and junior lien loans
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	163,879
Total Nonaccrual	98
Nonaccrual With No Allowance For Credit Loss	98
Consumer 1-4 family loans | Open end and junior lien loans | Total Accruing
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	163,781
Consumer 1-4 family loans | Open end and junior lien loans | Loans Not Past Due
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	163,861
Consumer 1-4 family loans | Open end and junior lien loans | 30-89 Days Past Due
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	18
Consumer 1-4 family loans | Open end and junior lien loans | Greater than 89 Days Past Due and Accruing
Financing Receivable, Amortized Cost, Aging [Abstract]
Greater than 89 Days Past Due and Accruing	0
Consumer 1-4 family loans | Residential construction loans
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	12,454
Total Nonaccrual	0
Nonaccrual With No Allowance For Credit Loss	0
Consumer 1-4 family loans | Residential construction loans | Total Accruing
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	12,454
Consumer 1-4 family loans | Residential construction loans | Loans Not Past Due
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	12,454
Consumer 1-4 family loans | Residential construction loans | 30-89 Days Past Due
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	0
Consumer 1-4 family loans | Residential construction loans | Greater than 89 Days Past Due and Accruing
Financing Receivable, Amortized Cost, Aging [Abstract]
Greater than 89 Days Past Due and Accruing	0
Consumer 1-4 family loans | Other consumer loans
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	100,549
Total Nonaccrual	253
Nonaccrual With No Allowance For Credit Loss	0
Consumer 1-4 family loans | Other consumer loans | Total Accruing
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	100,296
Consumer 1-4 family loans | Other consumer loans | Loans Not Past Due
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	100,440
Consumer 1-4 family loans | Other consumer loans | 30-89 Days Past Due
Financing Receivable, Amortized Cost, Aging [Abstract]
Financing receivable, before allowance for credit loss, amortized cost	109
Consumer 1-4 family loans | Other consumer loans | Greater than 89 Days Past Due and Accruing
Financing Receivable, Amortized Cost, Aging [Abstract]
Greater than 89 Days Past Due and Accruing	$ 0

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