Other Assets (Policies)	3 Months Ended
Other Assets (Policies)	Mar. 31, 2018
Other Assets [Abstract]
Life Settlement Contracts, Disclosure	The Company has purchased life insurance policies on certain employees and has also acquired life insurance policies through acquisitions. BOLI is recorded at the amount that can be realized under the insurance contract, which is the cash surrender value. The increase in the cash surrender value each period is recorded to "Noninterest income - other."

The entire disclosure for life settlement contracts including the accounting policy for life settlement contracts and the classification of cash receipts and cash disbursements in the statement of cash flows and, as applicable, for (1) life settlement contracts accounted for under the investment method based on the remaining life expectancy for each of the first five succeeding years from the date of the statement of financial position and thereafter, as well as in the aggregate: (a) the number of life settlement contracts, (b) the carrying value of the life settlement contracts, and (c) the face value (death benefits) of the life insurance policies underlying the contracts, (d) the life insurance premiums anticipated to be paid for each of the five succeeding fiscal years to keep the life settlement contracts in force as of the date of the most recent statement of financial position presented, (e) the nature of the information that causes the Entity to change its expectations on the timing of the realization of proceeds from the investments in life settlement contracts and the related effect on the timing of the realization of proceeds from the life settlement contracts and for (2) life settlement contracts accounted for under the fair value method, disclosure would include, based on remaining life expectancy for each of the first five succeeding years from the date of the statement of financial position and thereafter, as well as in the aggregate: (a) the number of life settlement contracts, (b) the carrying value of the life settlement contracts, (c) the face value (death benefits) of the life insurance policies underlying the contracts, (d) the reasons for changes in the Entity's expectation of the timing of the realization of the investments in life settlement contracts, and (e) (i) the gains or losses recognized during the period on investments sold during the period and (ii) the unrealized gains or losses recognized during the period on investments that are still held at the date of the statement of financial position.