Quarterly report pursuant to Section 13 or 15(d)

SECURITIES (Amortized Cost, Gross Unrealized Gains and Losses, and Estimated Fair Values of Investment Securities) (Details)

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SECURITIES (Amortized Cost, Gross Unrealized Gains and Losses, and Estimated Fair Values of Investment Securities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Amortized cost, gross unrealized gains and losses, and estimated fair values of investment securities    
Amortized Cost $ 874,869 $ 1,075,235
Gross Unrealized Gains 17,231 28,737
Gross Unrealized (Losses) (3,738) (1,858)
Estimated Fair Value 888,362 1,102,114
US Government Agencies Debt Securities [Member]    
Amortized cost, gross unrealized gains and losses, and estimated fair values of investment securities    
Amortized Cost 8,149 8,313
Gross Unrealized Gains $ 231 166
Gross Unrealized (Losses)   (25)
Estimated Fair Value $ 8,380 8,454
Obligations of States and Political Subdivisions [Member]    
Amortized cost, gross unrealized gains and losses, and estimated fair values of investment securities    
Amortized Cost 241,323 427,483
Gross Unrealized Gains 7,811 18,885
Gross Unrealized (Losses) (1,493) (721)
Estimated Fair Value 247,641 445,647
Corporate and Other Securities [Member]    
Amortized cost, gross unrealized gains and losses, and estimated fair values of investment securities    
Amortized Cost 75,551 78,744
Gross Unrealized Gains 67 244
Gross Unrealized (Losses) (464) (308)
Estimated Fair Value 75,154 78,680
Mortgage Backed Securities [Member]    
Amortized cost, gross unrealized gains and losses, and estimated fair values of investment securities    
Amortized Cost 539,665 550,716
Gross Unrealized Gains 9,094 9,411
Gross Unrealized (Losses) (1,765) (798)
Estimated Fair Value 546,994 559,329
Other Securities [Member]    
Amortized cost, gross unrealized gains and losses, and estimated fair values of investment securities    
Amortized Cost 10,181 9,979
Gross Unrealized Gains 28 31
Gross Unrealized (Losses) (16) (6)
Estimated Fair Value $ 10,193 $ 10,004