AFS Securities (AFS securities with gross unrealized losses) (Details) $ in Thousands	Jun. 30, 2016 USD ($) Securities	Dec. 31, 2015 USD ($) Securities
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Losses, Less Than Twelve Months		$ 1,311
Fair Value, Less Than Twelve Months		188,681
Gross Unrealized Losses, Twelve Months or More	$ 539	2,717
Fair Value, Twelve Months or More	19,714	77,609
Total Unrealized Losses	$ 539	$ 4,028
Number of Securities in an unrealized loss position, Less Than Twelve Months, Fair Value | Securities	0	36
Number of Securities in an unrealized loss position, Twelve Months or More, Fair Value | Securities	9	26
Number of Securities in an unrealized loss position, Total Unrealized Losses | Securities	9	62
Government sponsored enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Losses, Less Than Twelve Months		$ 0
Fair Value, Less Than Twelve Months		0
Gross Unrealized Losses, Twelve Months or More	$ 0	75
Fair Value, Twelve Months or More	0	4,925
Total Unrealized Losses	0	75
States and political subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Losses, Less Than Twelve Months		14
Fair Value, Less Than Twelve Months		3,355
Gross Unrealized Losses, Twelve Months or More	14	32
Fair Value, Twelve Months or More	439	2,623
Total Unrealized Losses	14	46
Auction rate money market preferred [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Losses, Less Than Twelve Months		0
Fair Value, Less Than Twelve Months		0
Gross Unrealized Losses, Twelve Months or More	81	334
Fair Value, Twelve Months or More	3,119	2,866
Total Unrealized Losses	81	334
Preferred stocks [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Losses, Less Than Twelve Months		0
Fair Value, Less Than Twelve Months		0
Gross Unrealized Losses, Twelve Months or More	394	501
Fair Value, Twelve Months or More	3,406	3,299
Total Unrealized Losses	394	501
Mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Losses, Less Than Twelve Months		882
Fair Value, Less Than Twelve Months		131,885
Gross Unrealized Losses, Twelve Months or More	0	999
Fair Value, Twelve Months or More	0	37,179
Total Unrealized Losses	0	1,881
Collateralized mortgage obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Losses, Less Than Twelve Months		415
Fair Value, Less Than Twelve Months		53,441
Gross Unrealized Losses, Twelve Months or More	50	776
Fair Value, Twelve Months or More	12,750	26,717
Total Unrealized Losses	$ 50	$ 1,191