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SECURITIES - Amortized Cost and Estimated Fair Value by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Available for sale, Amortized Cost
Within 1 year	$ 34,900
Over 1 year to 5 years	20,372
Over 5 years to 10 years	68,139
Over 10 years	136,723
Total bonds and obligations	260,134
Mortgage-backed securities	1,037,205
Amortized Cost	1,297,339	$ 1,421,273
Available for sale, Fair Value
Within 1 year	34,996
Over 1 year to 5 years	20,292
Over 5 years to 10 years	69,673
Over 10 years	142,942
Total bonds and obligations	267,903
Mortgage-backed securities	1,043,652
Available-for-securities	1,311,555	1,399,647
Held to maturity, Amortized Cost
Within 1 year	1,849
Over 1 year to 5 years	14,269
Over 5 years to 10 years	12,541
Over 10 years	243,029
Total bonds and obligations	271,688
Mortgage-backed securities	86,291
Amortized Cost	357,979	373,763
Held to maturity, Fair Value
Within 1 year	1,849
Over 1 year to 5 years	14,403
Over 5 years to 10 years	12,711
Over 10 years	255,123
Total bonds and obligations	284,086
Mortgage-backed securities	89,191
Held-to-maturity securities	$ 373,277	$ 371,224

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