Fair Value Measurements, Measured On Recurring Basis Significant Unobservable Inputs (Details) - Fair Value, Measurements, Recurring [Member] - Fair Value, Inputs, Level 3 [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Available-for-sale securities [Member] | Municipal and other tax-exempt securities
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]
Balance, beginning of period	$ 9,600	$ 9,617	$ 9,610	$ 10,093
Transfer to Level 3 from Level 2	0	0	0	0
Purchases	0	0	0	0
Proceeds from sales	0	0	0	0
Redemptions and distributions	(3,975)	0	(3,975)	(500)
Other comprehensive income (loss)	88	(17)	78	7
Balance, end of period	5,713	9,600	5,713	9,600
Available-for-sale securities [Member] | Municipal and other tax-exempt securities | Mortgage banking revenue [Member]
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]
Gain (loss) recognized in earnings	0	0	0	0
Available-for-sale securities [Member] | Other debt securities
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]
Balance, beginning of period	4,151	4,150	4,151	4,150
Transfer to Level 3 from Level 2	0	0	0	0
Purchases	0	0	0	0
Proceeds from sales	0	0	0	0
Redemptions and distributions	0	0	0	0
Other comprehensive income (loss)	0	0	0	0
Balance, end of period	4,151	4,150	4,151	4,150
Available-for-sale securities [Member] | Other debt securities | Mortgage banking revenue [Member]
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]
Gain (loss) recognized in earnings	0	0	0	0
Residential mortgage loans held for sale [Member]
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]
Balance, beginning of period	9,749	7,973	7,874	11,856
Transfer to Level 3 from Level 2	442	966	3,982	2,153
Purchases	0	0	0	0
Proceeds from sales	(1,003)	(811)	(2,365)	(6,099)
Redemptions and distributions	0	0	0	0
Other comprehensive income (loss)	0	0	0	0
Balance, end of period	9,301	8,033	9,301	8,033
Residential mortgage loans held for sale [Member] | Mortgage banking revenue [Member]
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]
Gain (loss) recognized in earnings	$ 113	$ (95)	$ (190)	$ 123