SUBSEQUENT EVENTS - Additional Information (Details)								2 Months Ended	3 Months Ended		9 Months Ended
	Feb. 28, 2017 USD ($)	Feb. 07, 2017 USD ($)	Jan. 23, 2017 USD ($) committee	Dec. 12, 2016 USD ($)	Oct. 27, 2016 USD ($)	Oct. 25, 2016 USD ($)	Apr. 06, 2015 USD ($)	Dec. 12, 2016 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Feb. 09, 2017	Jan. 25, 2017 USD ($)	Dec. 31, 2016 USD ($)	Nov. 29, 2016 USD ($)	Dec. 31, 2015 USD ($)
Subsequent Event [Line Items]
Net gain on sale of loans									$ 11,063,000	$ 9,737,000	$ 15,405,000	$ 22,047,000
Line of credit outstanding balance									49,903,000		49,903,000						$ 0
Expenses from transactions with related parties							$ 263,000
Proceeds from sale of mortgage servicing rights											5,000	$ 5,862,000
Subsequent Event
Subsequent Event [Line Items]
Line of credit outstanding balance														$ 68,000,000		$ 68,000,000
Accrued bonuses															$ 1,500,000
Period of continuation of health care benefits			3 years
Number of committees after separation | committee			2
Servicing assets held for disposal	$ 3,800,000,000
Proceeds from sale of mortgage servicing rights	36,000,000
Loss on sale of MSRs	3,500,000
Subsequent Event | Consumer | Single family residential mortgage
Subsequent Event [Line Items]
Proceeds from sale of loans				$ 441,200,000		$ 162,800,000
Net gain on sale of loans								$ 19,100,000
Commercial Equipment Finance Division | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Subsequent Event [Line Items]
Total lease balances									$ 234,000,000		$ 234,000,000
Commercial Equipment Finance Division | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Subsequent Event
Subsequent Event [Line Items]
Gain on sale of business unit					$ 2,600,000
Total lease balances					$ 217,200,000										$ 25,400,000
Specified Assets Included in Mortgage Banking Segment | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Subsequent Event
Subsequent Event [Line Items]
Consideration	25,000,000
Non-cash consideration	$ 2,700,000
Earn-out performance period	38 months
Affiliated Entity | PL Capital Advisors, LLC | Subsequent Event
Subsequent Event [Line Items]
Percentage of common stock ownership		6.90%
Maximum ownership percentage by noncontrolling owners		10.00%
Affiliated Entity | Patriot Financial Partners, L.P. | Subsequent Event
Subsequent Event [Line Items]
Percentage of common stock ownership													6.20%
January 31, 2017 | Subsequent Event
Subsequent Event [Line Items]
Severance benefits			$ 1,040,000
Six Month Anniversary | Subsequent Event
Subsequent Event [Line Items]
Severance benefits			360,000
Six Month Anniversary To Twelve Month Anniversary | Subsequent Event
Subsequent Event [Line Items]
Severance benefits			$ 1,350,000
Legal Fees | Affiliated Entity | PL Capital Advisors, LLC | Subsequent Event
Subsequent Event [Line Items]
Expenses from transactions with related parties		$ 150,000
Loan Officer Retention | Specified Assets Included in Mortgage Banking Segment | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Subsequent Event
Subsequent Event [Line Items]
Contingent consideration	$ 5,000,000
Buyout Option, Future Earn-Out Receivable | Specified Assets Included in Mortgage Banking Segment | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Subsequent Event
Subsequent Event [Line Items]
Contingent consideration	$ 35,000,000