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PARENT COMPANY STATEMENTS, Condensed Statements of Condition (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Assets [Abstract]        
Cash and cash equivalents $ 221,038 $ 173,857 $ 153,210 $ 138,396
Investment in and advances to [Abstract]        
Other assets 249,488 180,188    
Total assets 10,746,198 8,666,437 8,552,669  
Liabilities and shareholders' equity [Abstract]        
Accrued interest and other liabilities 180,567 144,013    
Borrowings 122,814 102,170    
Shareholders' equity 1,635,315 1,198,100 1,140,647 987,904
Total liabilities and shareholders' equity 10,746,198 8,666,437    
Parent Company [Member]        
Assets [Abstract]        
Cash and cash equivalents 84,460 151,127 $ 97,317 $ 106,957
Investment securities 4,322 3,628    
Investment in and advances to [Abstract]        
Bank subsidiary 1,511,780 1,116,554    
Non-bank subsidiaries 169,341 35,566    
Other assets 9,150 10,345    
Total assets 1,779,053 1,317,220    
Liabilities and shareholders' equity [Abstract]        
Accrued interest and other liabilities 20,924 16,950    
Borrowings 122,814 102,170    
Shareholders' equity 1,635,315 1,198,100    
Total liabilities and shareholders' equity $ 1,779,053 $ 1,317,220