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		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - Impaired Loans Individually Evaluated by Class (Continued) [Line Items]
Average Recorded Investment		$ 20,024	$ 29,548	$ 17,908	$ 34,033
Interest Income Recognized	[1]	94	19	200	129
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 Investment		3,236	9,277	3,114	12,783
Interest Income Recognized	[1]	12	6	50	76
Agricultural
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - Impaired Loans Individually Evaluated by Class (Continued) [Line Items]
Average Recorded Investment		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 Investment		12,713	11,188	10,529	11,570
Interest Income Recognized	[1]	29	4	77	33
Multi-family
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - Impaired Loans Individually Evaluated by Class (Continued) [Line Items]
Average Recorded Investment		401	866	534	890
Interest Income Recognized	[1]	0	1	1	1
Construction
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - Impaired Loans Individually Evaluated by Class (Continued) [Line Items]
Average Recorded Investment		34	5,395	82	5,820
Interest Income Recognized	[1]	0	0	0	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 Investment		3,641	2,822	3,649	2,970
Interest Income Recognized	[1]	53	8	72	19
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 Investment		16,788	20,271	14,794	21,250
Interest Income Recognized	[1]	$ 82	$ 13	$ 150	$ 53

[1] Recorded using the cash basis of accounting.