Past Due Loans, Allowance For Credit Losses, Impaired Loans and TDRS (Details) - Impaired Loans Individually Evaluated by Class (Continued) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - Impaired Loans Individually Evaluated by Class (Continued) [Line Items]
Average Recorded Balance		$ 22,144	$ 48,191	$ 29,538	$ 49,452
Interest Income Recognized	[1]	186	82	315	491
Commercial And Industrial
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - Impaired Loans Individually Evaluated by Class (Continued) [Line Items]
Average Recorded Balance		5,968	20,137	10,457	15,222
Interest Income Recognized	[1]	37	57	113	204
Agricultural
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - Impaired Loans Individually Evaluated by Class (Continued) [Line Items]
Average Recorded Balance		0	0	0	0
Interest Income Recognized	[1]	0	0	0	0
Office Retail and Industrial
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - Impaired Loans Individually Evaluated by Class (Continued) [Line Items]
Average Recorded Balance		8,814	15,873	10,158	20,671
Interest Income Recognized	[1]	4	3	37	150
Multi-Family
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - Impaired Loans Individually Evaluated by Class (Continued) [Line Items]
Average Recorded Balance		925	1,155	868	1,321
Interest Income Recognized	[1]	12	0	13	0
Construction
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - Impaired Loans Individually Evaluated by Class (Continued) [Line Items]
Average Recorded Balance		2,995	5,792	4,833	5,537
Interest Income Recognized	[1]	118	0	118	0
Other Commercial Real Estate
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - Impaired Loans Individually Evaluated by Class (Continued) [Line Items]
Average Recorded Balance		3,442	5,234	3,222	6,701
Interest Income Recognized	[1]	15	22	34	137
Total Commercial Real Estate
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - Impaired Loans Individually Evaluated by Class (Continued) [Line Items]
Average Recorded Balance		16,176	28,054	19,081	34,230
Interest Income Recognized	[1]	$ 149	$ 25	$ 202	$ 287

[1] Recorded using the cash basis of accounting.