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SECURITIES AVAILABLE FOR SALE, HELD TO MATURITY, AND OTHER - Schedule of Maturity of Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Available for sale, Amortized Cost
Within 1 year	$ 387
Over 1 year to 5 years	33,130
Over 5 years to 10 years	75,568
Over 10 years	125,505
Total bonds and obligations	234,590
Mortgage-backed securities	1,191,810
Available-for-sale debt securities, amortized cost basis	1,426,400	$ 1,387,250
Available for sale, Fair Value
Within 1 year	388
Over 1 year to 5 years	33,297
Over 5 years to 10 years	76,746
Over 10 years	127,376
Total bonds and obligations	237,807
Mortgage-backed securities	1,163,592
Available for sale securities	1,401,399	1,380,914
Held to maturity, Amortized Cost
Within 1 year	15,013
Over 1 year to 5 years	13,189
Over 5 years to 10 years	7,999
Over 10 years	267,752
Total bonds and obligations	303,953
Mortgage-backed securities	91,384
Held to maturity, amortized cost basis	395,337	397,103
Held to maturity, Fair Value
Within 1 year	15,336
Over 1 year to 5 years	13,174
Over 5 years to 10 years	8,079
Over 10 years	267,793
Total bonds and obligations	304,382
Total bonds and obligations	89,914
Fair Value	$ 394,296	$ 405,276

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