Derivative Financial Instruments, Effect on Statement of Operations (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Effect of derivative financial instruments on the condensed consolidated financial statements of operations [Abstract]
Gain (Loss) Recognized in Other Comprehensive Income (Loss) (Effective Portion)		$ (72)	$ 389	$ (1,740)	$ 1,400
Fair Value Hedge Designation [Member] | Interest Rate Swap [Member] | Non-Interest Income-Other [Member]
Effect of derivative financial instruments on the condensed consolidated financial statements of operations [Abstract]
Gain (Loss) Recognized in Income	[1]	(188)	0	(391)	0
Cash Flow Hedge Designation [Member]
Effect of derivative financial instruments on the condensed consolidated financial statements of operations [Abstract]
Gain (Loss) Recognized in Other Comprehensive Income (Loss) (Effective Portion)		(72)	389	(1,740)	1,400
Gain Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion)		102	73	393	132
Gain (Loss) Recognized in Income	[1]	0	16	0	4
Cash Flow Hedge Designation [Member] | Interest-Rate Cap Agreements [Member]
Effect of derivative financial instruments on the condensed consolidated financial statements of operations [Abstract]
Gain (Loss) Recognized in Other Comprehensive Income (Loss) (Effective Portion)		(37)	297	(1,311)	1,054
Cash Flow Hedge Designation [Member] | Interest-Rate Cap Agreements [Member] | Interest Expense [Member]
Effect of derivative financial instruments on the condensed consolidated financial statements of operations [Abstract]
Gain Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion)		88	67	321	119
Gain (Loss) Recognized in Income	[1]	0	0	0	0
Cash Flow Hedge Designation [Member] | Fixed Income Interest Rate [Member] | Interest Rate Swap [Member]
Effect of derivative financial instruments on the condensed consolidated financial statements of operations [Abstract]
Gain (Loss) Recognized in Other Comprehensive Income (Loss) (Effective Portion)		(35)	92	(429)	346
Cash Flow Hedge Designation [Member] | Fixed Income Interest Rate [Member] | Interest Rate Swap [Member] | Interest Expense [Member]
Effect of derivative financial instruments on the condensed consolidated financial statements of operations [Abstract]
Gain Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion)		14	6	72	13
Gain (Loss) Recognized in Income	[1]	0	16	0	4
No Hedge Designation [Member]
Effect of derivative financial instruments on the condensed consolidated financial statements of operations [Abstract]
Gain (Loss) Recognized in Income		211	97	1,721	499
No Hedge Designation [Member] | Rate-Lock Mortgage Loan Commitments [Member] | Mortgage Loan Gains [Member]
Effect of derivative financial instruments on the condensed consolidated financial statements of operations [Abstract]
Gain (Loss) Recognized in Income		(96)	(318)	1,364	354
No Hedge Designation [Member] | Mandatory Commitments to Sell Mortgage Loans [Member] | Mortgage Loan Gains [Member]
Effect of derivative financial instruments on the condensed consolidated financial statements of operations [Abstract]
Gain (Loss) Recognized in Income		307	415	356	145
No Hedge Designation [Member] | Purchased Options [Member] | Interest Expense [Member]
Effect of derivative financial instruments on the condensed consolidated financial statements of operations [Abstract]
Gain (Loss) Recognized in Income				9	(144)
No Hedge Designation [Member] | Purchased Options [Member] | Interest Income [Member]
Effect of derivative financial instruments on the condensed consolidated financial statements of operations [Abstract]
Gain (Loss) Recognized in Income		(46)	(45)
No Hedge Designation [Member] | Written Options [Member] | Interest Expense [Member]
Effect of derivative financial instruments on the condensed consolidated financial statements of operations [Abstract]
Gain (Loss) Recognized in Income				(8)	144
No Hedge Designation [Member] | Written Options [Member] | Interest Income [Member]
Effect of derivative financial instruments on the condensed consolidated financial statements of operations [Abstract]
Gain (Loss) Recognized in Income		46	45
No Hedge Designation [Member] | Fixed Income Interest Rate [Member] | Interest Rate Swap [Member] | Interest Income [Member]
Effect of derivative financial instruments on the condensed consolidated financial statements of operations [Abstract]
Gain (Loss) Recognized in Income		(1,670)	407	(5,254)	1,950
No Hedge Designation [Member] | Variable Income Interest Rate [Member] | Interest Rate Swap [Member] | Interest Income [Member]
Effect of derivative financial instruments on the condensed consolidated financial statements of operations [Abstract]
Gain (Loss) Recognized in Income		$ 1,670	$ (407)	$ 5,254	$ (1,950)

[1] For cash flow hedges, this location and amount refers to the ineffective portion.