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New Accounting Standards (Q3) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cumulative Effect Adjustments to Condensed Consolidated Statement of Financial Position [Abstract]              
Deferred tax assets, net   $ 22,433 $ 32,818   $ 39,635    
Capitalized mortgage loan servicing rights   14,675 13,671   12,436 $ 12,106 $ 13,710
Total assets   2,753,446 2,548,950   2,409,066    
Accumulated deficit   (53,240) (65,657)   (82,334)    
Accumulated other comprehensive loss   (3,657) (9,108)   (6,036)    
Total shareholders' equity   267,710 248,980 $ 250,902 251,092 $ 250,371 $ 231,581
Total Liabilities and Shareholders' Equity   $ 2,753,446 2,548,950   $ 2,409,066    
Cumulative effect of adjustments     400        
Originally Presented [Member]              
Cumulative Effect Adjustments to Condensed Consolidated Statement of Financial Position [Abstract]              
Deferred tax assets, net     32,818        
Capitalized mortgage loan servicing rights     13,671        
Total assets     2,548,950        
Accumulated deficit     (65,657)        
Accumulated other comprehensive loss     (9,108)        
Total shareholders' equity     248,980        
Total Liabilities and Shareholders' Equity     2,548,950        
Cumulative Retrospective Adjustments [Member]              
Cumulative Effect Adjustments to Condensed Consolidated Statement of Financial Position [Abstract]              
Total shareholders' equity     352        
Total Liabilities and Shareholders' Equity     352        
Change in Accounting Method and ASU 2017-08 [Member]              
Cumulative Effect Adjustments to Condensed Consolidated Statement of Financial Position [Abstract]              
Total shareholders' equity     249,332        
Total Liabilities and Shareholders' Equity     2,549,302        
Change in Accounting Method [Member]              
Cumulative Effect Adjustments to Condensed Consolidated Statement of Financial Position [Abstract]              
Deferred tax assets, net     32,628        
Capitalized mortgage loan servicing rights     14,213        
Total assets     2,549,302        
Change in Accounting Method [Member] | Cumulative Retrospective Adjustments [Member]              
Cumulative Effect Adjustments to Condensed Consolidated Statement of Financial Position [Abstract]              
Deferred tax assets, net [1]     (190)        
Capitalized mortgage loan servicing rights [1]     542        
Total assets     352        
Accumulated deficit [1]     352        
New Accounting Pronouncement, Effect of Early Adoption [Member] | Additional Premium Amortization on AFS Securities, Pre-tax [Member]              
Cumulative Effect Adjustments to Condensed Consolidated Statement of Financial Position [Abstract]              
Cumulative effect of adjustments     460        
New Accounting Pronouncement, Effect of Early Adoption [Member] | Additional Premium Amortization on AFS Securities, Net of Tax [Member]              
Cumulative Effect Adjustments to Condensed Consolidated Statement of Financial Position [Abstract]              
Cumulative effect of adjustments     300        
New Accounting Pronouncement, Effect of Early Adoption [Member] | AOCI Decrease, Unrealized Losses AFS Securities, After Tax [Member]              
Cumulative Effect Adjustments to Condensed Consolidated Statement of Financial Position [Abstract]              
Cumulative effect of adjustments     300        
ASU 2017-08 [Member]              
Cumulative Effect Adjustments to Condensed Consolidated Statement of Financial Position [Abstract]              
Accumulated deficit     (65,605)        
Accumulated other comprehensive loss     (8,808)        
Increase in premium amortization on securities available for sale $ 30            
ASU 2017-08 [Member] | Cumulative Retrospective Adjustments [Member]              
Cumulative Effect Adjustments to Condensed Consolidated Statement of Financial Position [Abstract]              
Accumulated deficit [2]     (300)        
Accumulated other comprehensive loss [2]     $ 300        
[1] Represents adjustment to capitalized mortgage loan servicing rights, deferred tax assets, net, and accumulated deficit to reflect the adoption of the fair value method of accounting for our capitalized mortgage loan servicing rights.
[2] Represents adjustment to accumulated deficit and accumulated other comprehensive loss to reflect the adoption of ASU 2017-08.