Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE MEASUREMENTS (Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details)

v3.10.0.1
FAIR VALUE MEASUREMENTS (Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
ASSETS    
Securities available for sale $ 1,883,141 $ 974,222
Marketable securities 27,375 0
Loans held for sale 360 40,662
Cash flow hedges   49
Fair value hedges 3,468 1,598
Best efforts forward delivery commitments   12
LIABILITIES    
Interest rate swap 23,943 1,350
Cash flow hedges 2,526 8,005
Fair value hedges   76
Quoted Prices in Active Markets for Identical Assets Level 1    
ASSETS    
Securities available for sale 0 0
Marketable securities 27,375  
Loans held for sale 0 0
Cash flow hedges   0
Fair value hedges 0 0
Best efforts forward delivery commitments   0
LIABILITIES    
Interest rate swap 0 0
Cash flow hedges 0 0
Fair value hedges   0
Significant Other Observable Inputs Level 2    
ASSETS    
Securities available for sale 1,883,141 974,222
Marketable securities 0  
Loans held for sale 360 40,662
Cash flow hedges   49
Fair value hedges 3,468 1,598
Best efforts forward delivery commitments   0
LIABILITIES    
Interest rate swap 23,943 1,350
Cash flow hedges 2,526 8,005
Fair value hedges   76
Significant Unobservable Inputs Level 3    
ASSETS    
Securities available for sale 0 0
Marketable securities 0  
Loans held for sale 0 0
Cash flow hedges   0
Fair value hedges 0 0
Best efforts forward delivery commitments   12
LIABILITIES    
Interest rate swap 0 0
Cash flow hedges 0 0
Fair value hedges   0
Recurring    
ASSETS    
Marketable securities 27,375  
Loans held for sale 360 40,662
Interest rate derivative 23,943 1,350
Cash flow hedges   49
Fair value hedges 3,468 1,598
Best efforts forward delivery commitments   12
LIABILITIES    
Interest rate swap 23,943 1,350
Cash flow hedges 2,526 8,005
Fair value hedges   76
Recurring | Quoted Prices in Active Markets for Identical Assets Level 1    
ASSETS    
Marketable securities 27,375  
Loans held for sale 0 0
Interest rate derivative 0 0
Cash flow hedges   0
Fair value hedges 0 0
Best efforts forward delivery commitments   0
LIABILITIES    
Interest rate swap 0 0
Cash flow hedges 0 0
Fair value hedges   0
Recurring | Significant Other Observable Inputs Level 2    
ASSETS    
Marketable securities 0  
Loans held for sale 360 40,662
Interest rate derivative 23,943 1,350
Cash flow hedges   49
Fair value hedges 3,468 1,598
Best efforts forward delivery commitments   0
LIABILITIES    
Interest rate swap 23,943 1,350
Cash flow hedges 2,526 8,005
Fair value hedges   76
Recurring | Significant Unobservable Inputs Level 3    
ASSETS    
Marketable securities 0  
Loans held for sale 0 0
Interest rate derivative 0 0
Cash flow hedges   0
Fair value hedges 0 0
Best efforts forward delivery commitments   12
LIABILITIES    
Interest rate swap 0 0
Cash flow hedges 0 0
Fair value hedges   0
Obligations of States and Political Subdivisions | Recurring    
ASSETS    
Securities available for sale 563,473 301,824
Obligations of States and Political Subdivisions | Recurring | Quoted Prices in Active Markets for Identical Assets Level 1    
ASSETS    
Securities available for sale 0 0
Obligations of States and Political Subdivisions | Recurring | Significant Other Observable Inputs Level 2    
ASSETS    
Securities available for sale 563,473 301,824
Obligations of States and Political Subdivisions | Recurring | Significant Unobservable Inputs Level 3    
ASSETS    
Securities available for sale 0 0
Interest Rate Lock Commitments | Recurring    
ASSETS    
Interest rate derivative   559
Interest Rate Lock Commitments | Recurring | Quoted Prices in Active Markets for Identical Assets Level 1    
ASSETS    
Interest rate derivative   0
Interest Rate Lock Commitments | Recurring | Significant Other Observable Inputs Level 2    
ASSETS    
Interest rate derivative   0
Interest Rate Lock Commitments | Recurring | Significant Unobservable Inputs Level 3    
ASSETS    
Interest rate derivative   559
Corporate and Other Bonds | Recurring    
ASSETS    
Securities available for sale 161,492 113,880
Corporate and Other Bonds | Recurring | Quoted Prices in Active Markets for Identical Assets Level 1    
ASSETS    
Securities available for sale 0 0
Corporate and Other Bonds | Recurring | Significant Other Observable Inputs Level 2    
ASSETS    
Securities available for sale 161,492 113,880
Corporate and Other Bonds | Recurring | Significant Unobservable Inputs Level 3    
ASSETS    
Securities available for sale 0 0
Mortgage-Backed Securities | Recurring    
ASSETS    
Securities available for sale 1,146,913 548,858
Mortgage-Backed Securities | Recurring | Quoted Prices in Active Markets for Identical Assets Level 1    
ASSETS    
Securities available for sale 0 0
Mortgage-Backed Securities | Recurring | Significant Other Observable Inputs Level 2    
ASSETS    
Securities available for sale 1,146,913 548,858
Mortgage-Backed Securities | Recurring | Significant Unobservable Inputs Level 3    
ASSETS    
Securities available for sale 0 0
Other Securities | Recurring    
ASSETS    
Securities available for sale 11,263 9,660
Other Securities | Recurring | Quoted Prices in Active Markets for Identical Assets Level 1    
ASSETS    
Securities available for sale 0 0
Other Securities | Recurring | Significant Other Observable Inputs Level 2    
ASSETS    
Securities available for sale 11,263 9,660
Other Securities | Recurring | Significant Unobservable Inputs Level 3    
ASSETS    
Securities available for sale 0 0
Carrying Value    
ASSETS    
Securities available for sale 1,883,141 974,222
Marketable securities 27,375  
Loans held for sale 360 40,662
Cash flow hedges   49
Fair value hedges 3,468 1,598
Best efforts forward delivery commitments   12
LIABILITIES    
Interest rate swap 23,943 1,350
Cash flow hedges $ 2,526 8,005
Fair value hedges   $ 76