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The amortized cost and estimated fair value of investments available-for-sale at September 30, 2019 and December 31, 2018 by contractual maturity are shown in the table below. Expected maturities for residential mortgage backed securities will differ from (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Marketable Securities [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 701,956	$ 793,634
Investment securities available-for-sale, at fair value	708,545	784,139
US Government Agencies Debt Securities [Member]
Marketable Securities [Line Items]
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	78,924	128,148
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	79,178	125,545
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	79,835	119,856
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	79,809	118,883
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	12,826	12,146
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value	12,833	11,917
Residential Mortgage Backed Securities [Member]
Marketable Securities [Line Items]
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost	434,042	477,949
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value	438,029	472,231
US States and Political Subdivisions Debt Securities [Member]
Marketable Securities [Line Items]
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	6,116	8,097
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	6,185	8,167
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	16,474	15,025
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	16,940	15,081
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	36,028	21,626
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value	37,540	21,385
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost	3,062	1,066
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value	3,293	1,136
Corporate Debt Securities [Member]
Marketable Securities [Line Items]
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	8,032	8,003
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	8,114	8,076
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost	1,500	1,500
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value	1,500	1,500
US Treasury and Government [Member]
Marketable Securities [Line Items]
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost	24,919
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value	24,926
Investment Securities [Member]
Marketable Securities [Line Items]
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost	198	218
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value	198	218
Other Debt Obligations [Member]
Marketable Securities [Line Items]
Investment securities available-for-sale, at fair value	$ 745,343	$ 784,139

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