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The table below presents the recorded amount of assets and liabilities measured at fair value on a recurring basis as of September 30, 2019 and December 31, 2018. (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Abstract]
Corporate bonds	$ 708,545	$ 784,139
Other equity investments	198	218
Loans held for sale	52,199	19,254
Total assets measured at fair value on a recurring basis as of December 31, 2018	761,285	807,349
Mortgage banking derivatives	117	269
Total liabilities measured at fair value on a recurring basis as of December 31, 2018	717	269
Interest Rate Cap [Member]
Debt Securities, Available-for-sale [Abstract]
Interest rate swap derivatives	228
Mortgage banking derivatives	235
Mortgage Banking Derivative [Member]
Debt Securities, Available-for-sale [Abstract]
Interest rate swap derivatives	313	229
Mortgage banking derivatives	3
Interest Rate Swap [Member]
Debt Securities, Available-for-sale [Abstract]
Interest rate swap derivatives		3,727
Mortgage banking derivatives	362
Fair Value, Inputs, Level 1 [Member]
Debt Securities, Available-for-sale [Abstract]
Corporate bonds
Other equity investments
Loans held for sale
Total assets measured at fair value on a recurring basis as of December 31, 2018
Mortgage banking derivatives
Total liabilities measured at fair value on a recurring basis as of December 31, 2018
Fair Value, Inputs, Level 1 [Member] | Interest Rate Cap [Member]
Debt Securities, Available-for-sale [Abstract]
Interest rate swap derivatives
Mortgage banking derivatives
Fair Value, Inputs, Level 1 [Member] | Mortgage Banking Derivative [Member]
Debt Securities, Available-for-sale [Abstract]
Interest rate swap derivatives
Mortgage banking derivatives
Fair Value, Inputs, Level 1 [Member] | Interest Rate Swap [Member]
Debt Securities, Available-for-sale [Abstract]
Interest rate swap derivatives
Mortgage banking derivatives
Fair Value, Inputs, Level 2 [Member]
Debt Securities, Available-for-sale [Abstract]
Corporate bonds	698,733	774,345
Other equity investments
Loans held for sale	52,199	19,254
Total assets measured at fair value on a recurring basis as of December 31, 2018	751,160	797,326
Mortgage banking derivatives	117
Total liabilities measured at fair value on a recurring basis as of December 31, 2018	714
Fair Value, Inputs, Level 2 [Member] | Interest Rate Cap [Member]
Debt Securities, Available-for-sale [Abstract]
Interest rate swap derivatives	228
Mortgage banking derivatives	235
Fair Value, Inputs, Level 2 [Member] | Mortgage Banking Derivative [Member]
Debt Securities, Available-for-sale [Abstract]
Interest rate swap derivatives
Mortgage banking derivatives
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]
Debt Securities, Available-for-sale [Abstract]
Interest rate swap derivatives	228	3,727
Mortgage banking derivatives	362
Fair Value, Inputs, Level 3 [Member]
Debt Securities, Available-for-sale [Abstract]
Corporate bonds	9,812	9,794
Other equity investments	198	218
Loans held for sale
Total assets measured at fair value on a recurring basis as of December 31, 2018	10,125	10,023
Mortgage banking derivatives		269
Total liabilities measured at fair value on a recurring basis as of December 31, 2018	3	269
Fair Value, Inputs, Level 3 [Member] | Interest Rate Cap [Member]
Debt Securities, Available-for-sale [Abstract]
Interest rate swap derivatives
Mortgage banking derivatives
Fair Value, Inputs, Level 3 [Member] | Mortgage Banking Derivative [Member]
Debt Securities, Available-for-sale [Abstract]
Interest rate swap derivatives	313	229
Mortgage banking derivatives	3	269
Fair Value, Inputs, Level 3 [Member] | Interest Rate Swap [Member]
Debt Securities, Available-for-sale [Abstract]
Interest rate swap derivatives
Mortgage banking derivatives
US Government Agencies Debt Securities [Member]
Debt Securities, Available-for-sale [Abstract]
Corporate bonds	171,820	256,345
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Debt Securities, Available-for-sale [Abstract]
Corporate bonds
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Debt Securities, Available-for-sale [Abstract]
Corporate bonds	171,820	256,345
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Debt Securities, Available-for-sale [Abstract]
Corporate bonds
Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Abstract]
Corporate bonds	438,029	472,231
Loans held for sale	52,199	19,254
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Debt Securities, Available-for-sale [Abstract]
Corporate bonds
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Debt Securities, Available-for-sale [Abstract]
Corporate bonds	438,029	472,231
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Debt Securities, Available-for-sale [Abstract]
Corporate bonds
US States and Political Subdivisions Debt Securities [Member]
Debt Securities, Available-for-sale [Abstract]
Corporate bonds	63,958	45,769
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Debt Securities, Available-for-sale [Abstract]
Corporate bonds
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Debt Securities, Available-for-sale [Abstract]
Corporate bonds	63,958	45,769
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Debt Securities, Available-for-sale [Abstract]
Corporate bonds
Corporate Debt Securities [Member]
Debt Securities, Available-for-sale [Abstract]
Corporate bonds	9,614	9,576
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Debt Securities, Available-for-sale [Abstract]
Corporate bonds
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Debt Securities, Available-for-sale [Abstract]
Corporate bonds
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Debt Securities, Available-for-sale [Abstract]
Corporate bonds	9,614	$ 9,576
US Treasury and Government [Member]
Debt Securities, Available-for-sale [Abstract]
Corporate bonds	24,926
US Treasury and Government [Member] | Fair Value, Inputs, Level 1 [Member]
Debt Securities, Available-for-sale [Abstract]
Corporate bonds
US Treasury and Government [Member] | Fair Value, Inputs, Level 2 [Member]
Debt Securities, Available-for-sale [Abstract]
Corporate bonds	24,926
US Treasury and Government [Member] | Fair Value, Inputs, Level 3 [Member]
Debt Securities, Available-for-sale [Abstract]
Corporate bonds

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