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SECURITIES - Composition of Securities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt Securities, Available-for-sale [Line Items]      
Debt Securities, Available-for-sale, Amortized Cost $ 685,170    
Debt Securities, Available-for-sale, Gross Unrealized Gains 3,514 $ 6,975 [1]  
Debt Securities, Available-for-sale, Gross Unrealized Losses (8,628) (3,968) [1]  
Debt securities, available-for-sale 680,056 693,147  
Marketable equity securities 4,816 5,144  
Total Securities, Amortized Cost   695,284  
Total Securities, Gross Unrealized Gain   6,975  
Total Securities, Gross Unrealized Losses   (3,968)  
Total Securities, Fair Value 684,872 698,291  
Security purchased pending settlement 0 5,884 $ 0
U.S. Treasury securities      
Debt Securities, Available-for-sale [Line Items]      
Debt Securities, Available-for-sale, Amortized Cost 9,958 19,943  
Debt Securities, Available-for-sale, Gross Unrealized Gains 0 0  
Debt Securities, Available-for-sale, Gross Unrealized Losses (222) (154)  
Debt securities, available-for-sale 9,736 19,789  
Obligations of U.S. government corporations and agencies      
Debt Securities, Available-for-sale [Line Items]      
Debt Securities, Available-for-sale, Amortized Cost 129,267 162,045  
Debt Securities, Available-for-sale, Gross Unrealized Gains 68 341  
Debt Securities, Available-for-sale, Gross Unrealized Losses (1,074) (193)  
Debt securities, available-for-sale 128,261 162,193  
Collateralized mortgage obligations of U.S. government corporations and agencies      
Debt Securities, Available-for-sale [Line Items]      
Debt Securities, Available-for-sale, Amortized Cost 149,849 109,916  
Debt Securities, Available-for-sale, Gross Unrealized Gains 795 93  
Debt Securities, Available-for-sale, Gross Unrealized Losses (1,985) (1,321)  
Debt securities, available-for-sale 148,659 108,688  
Residential mortgage-backed securities of U.S. government corporations and agencies      
Debt Securities, Available-for-sale [Line Items]      
Debt Securities, Available-for-sale, Amortized Cost 24,564 32,388  
Debt Securities, Available-for-sale, Gross Unrealized Gains 203 679  
Debt Securities, Available-for-sale, Gross Unrealized Losses (417) (213)  
Debt securities, available-for-sale 24,350 32,854  
Commercial mortgage-backed securities of U.S. government corporations and agencies      
Debt Securities, Available-for-sale [Line Items]      
Debt Securities, Available-for-sale, Amortized Cost 251,660 244,018 [2]  
Debt Securities, Available-for-sale, Gross Unrealized Gains 0 247 [2]  
Debt Securities, Available-for-sale, Gross Unrealized Losses (4,876) (2,044) [2]  
Debt securities, available-for-sale 246,784 242,221 [2]  
Security purchased pending settlement   5,900  
Obligations of states and political subdivisions      
Debt Securities, Available-for-sale [Line Items]      
Debt Securities, Available-for-sale, Amortized Cost 119,872 123,159  
Debt Securities, Available-for-sale, Gross Unrealized Gains 2,448 4,285  
Debt Securities, Available-for-sale, Gross Unrealized Losses (54) (42)  
Debt securities, available-for-sale 122,266 127,402  
Total Debt Securities Available-for-Sale      
Debt Securities, Available-for-sale [Line Items]      
Debt Securities, Available-for-sale, Amortized Cost 685,170 691,469  
Debt Securities, Available-for-sale, Gross Unrealized Gains 3,514 5,645  
Debt Securities, Available-for-sale, Gross Unrealized Losses (8,628) (3,967)  
Debt securities, available-for-sale 680,056 693,147  
Total equity securities      
Debt Securities, Available-for-sale [Line Items]      
Equity Securities, FV-NI, Cost [3] 0 3,815  
Equity Securities, FV-NI, Unrealized Gain [3] 0 1,330  
Equity Securities, FV-NI, Unrealized Loss [3] 0 (1)  
Marketable equity securities [3] $ 0 $ 5,144  
[1] Gross unrealized gains and losses of $0.9 million at December 31, 2017 have been restated to reflect the reclassifications from OCI to retained earnings due to the adoption of ASU No. 2016-01
[2] Includes a $5.9 million security purchase that was pending settlement as of December 31, 2017.
[3] ASU No. 2016-01 was adopted January 1, 2018, resulting in separate classification of our marketable equity securities previously included in available-for-sale securities.