Loans and Allowances for Credit Losses, Impaired Loans (Details) $ in Thousands |
12 Months Ended |
Dec. 31, 2019
USD ($)
|
Impaired loans [Abstract] |
|
|
Impaired loans, unpaid principal balance |
$ 467,714
|
|
Impaired loans, recorded investment, total |
372,645
|
|
Impaired loans, recorded investment with no related allowance |
323,505
|
|
Impaired loans, recorded investment with related allowance |
49,140
|
|
Impaired loans, related allowance |
17,414
|
|
Impaired loans, average recorded investment |
354,262
|
|
Impaired loans, interest income recognized |
8,931
|
|
Commercial [Member] |
|
|
Impaired loans [Abstract] |
|
|
Impaired loans, unpaid principal balance |
195,193
|
|
Impaired loans, recorded investment, total |
115,416
|
|
Impaired loans, recorded investment with no related allowance |
66,276
|
|
Impaired loans, recorded investment with related allowance |
49,140
|
|
Impaired loans, related allowance |
17,414
|
|
Impaired loans, average recorded investment |
101,399
|
|
Impaired loans, interest income recognized |
0
|
|
Commercial [Member] | Energy [Member] |
|
|
Impaired loans [Abstract] |
|
|
Impaired loans, unpaid principal balance |
149,441
|
|
Impaired loans, recorded investment, total |
91,722
|
|
Impaired loans, recorded investment with no related allowance |
44,244
|
|
Impaired loans, recorded investment with related allowance |
47,478
|
|
Impaired loans, related allowance |
16,854
|
|
Impaired loans, average recorded investment |
69,119
|
|
Impaired loans, interest income recognized |
0
|
|
Commercial [Member] | Services [Member] |
|
|
Impaired loans [Abstract] |
|
|
Impaired loans, unpaid principal balance |
10,923
|
|
Impaired loans, recorded investment, total |
7,483
|
|
Impaired loans, recorded investment with no related allowance |
6,301
|
|
Impaired loans, recorded investment with related allowance |
1,182
|
|
Impaired loans, related allowance |
240
|
|
Impaired loans, average recorded investment |
5,854
|
|
Impaired loans, interest income recognized |
0
|
|
Commercial [Member] | Wholesale/retail [Member] |
|
|
Impaired loans [Abstract] |
|
|
Impaired loans, unpaid principal balance |
1,980
|
|
Impaired loans, recorded investment, total |
1,163
|
|
Impaired loans, recorded investment with no related allowance |
902
|
|
Impaired loans, recorded investment with related allowance |
261
|
|
Impaired loans, related allowance |
101
|
|
Impaired loans, average recorded investment |
916
|
|
Impaired loans, interest income recognized |
0
|
|
Commercial [Member] | Manufacturing [Member] |
|
|
Impaired loans [Abstract] |
|
|
Impaired loans, unpaid principal balance |
10,848
|
|
Impaired loans, recorded investment, total |
10,133
|
|
Impaired loans, recorded investment with no related allowance |
9,914
|
|
Impaired loans, recorded investment with related allowance |
219
|
|
Impaired loans, related allowance |
219
|
|
Impaired loans, average recorded investment |
9,144
|
|
Impaired loans, interest income recognized |
0
|
|
Commercial [Member] | Healthcare [Member] |
|
|
Impaired loans [Abstract] |
|
|
Impaired loans, unpaid principal balance |
13,774
|
|
Impaired loans, recorded investment, total |
4,480
|
|
Impaired loans, recorded investment with no related allowance |
4,480
|
|
Impaired loans, recorded investment with related allowance |
0
|
|
Impaired loans, related allowance |
0
|
|
Impaired loans, average recorded investment |
7,798
|
|
Impaired loans, interest income recognized |
0
|
|
Commercial [Member] | Public finance [Member] |
|
|
Impaired loans [Abstract] |
|
|
Impaired loans, unpaid principal balance |
0
|
|
Impaired loans, recorded investment, total |
0
|
|
Impaired loans, recorded investment with no related allowance |
0
|
|
Impaired loans, recorded investment with related allowance |
0
|
|
Impaired loans, related allowance |
0
|
|
Impaired loans, average recorded investment |
0
|
|
Impaired loans, interest income recognized |
0
|
|
Commercial [Member] | Other commercial and industrial [Member] |
|
|
Impaired loans [Abstract] |
|
|
Impaired loans, unpaid principal balance |
8,227
|
|
Impaired loans, recorded investment, total |
435
|
|
Impaired loans, recorded investment with no related allowance |
435
|
|
Impaired loans, recorded investment with related allowance |
0
|
|
Impaired loans, related allowance |
0
|
|
Impaired loans, average recorded investment |
8,568
|
|
Impaired loans, interest income recognized |
0
|
|
Commercial real estate [Member] |
|
|
Impaired loans [Abstract] |
|
|
Impaired loans, unpaid principal balance |
30,139
|
|
Impaired loans, recorded investment, total |
27,626
|
|
Impaired loans, recorded investment with no related allowance |
27,626
|
|
Impaired loans, recorded investment with related allowance |
0
|
|
Impaired loans, related allowance |
0
|
|
Impaired loans, average recorded investment |
24,623
|
|
Impaired loans, interest income recognized |
0
|
|
Commercial real estate [Member] | Residential construction and land development [Member] |
|
|
Impaired loans [Abstract] |
|
|
Impaired loans, unpaid principal balance |
1,306
|
|
Impaired loans, recorded investment, total |
350
|
|
Impaired loans, recorded investment with no related allowance |
350
|
|
Impaired loans, recorded investment with related allowance |
0
|
|
Impaired loans, related allowance |
0
|
|
Impaired loans, average recorded investment |
350
|
|
Impaired loans, interest income recognized |
0
|
|
Commercial real estate [Member] | Retail [Member] |
|
|
Impaired loans [Abstract] |
|
|
Impaired loans, unpaid principal balance |
20,265
|
|
Impaired loans, recorded investment, total |
18,868
|
|
Impaired loans, recorded investment with no related allowance |
18,868
|
|
Impaired loans, recorded investment with related allowance |
0
|
|
Impaired loans, related allowance |
0
|
|
Impaired loans, average recorded investment |
19,573
|
|
Impaired loans, interest income recognized |
0
|
|
Commercial real estate [Member] | Office [Member] |
|
|
Impaired loans [Abstract] |
|
|
Impaired loans, unpaid principal balance |
0
|
|
Impaired loans, recorded investment, total |
0
|
|
Impaired loans, recorded investment with no related allowance |
0
|
|
Impaired loans, recorded investment with related allowance |
0
|
|
Impaired loans, related allowance |
0
|
|
Impaired loans, average recorded investment |
0
|
|
Impaired loans, interest income recognized |
0
|
|
Commercial real estate [Member] | Multifamily [Member] |
|
|
Impaired loans [Abstract] |
|
|
Impaired loans, unpaid principal balance |
6,858
|
|
Impaired loans, recorded investment, total |
6,858
|
|
Impaired loans, recorded investment with no related allowance |
6,858
|
|
Impaired loans, recorded investment with related allowance |
0
|
|
Impaired loans, related allowance |
0
|
|
Impaired loans, average recorded investment |
3,580
|
|
Impaired loans, interest income recognized |
0
|
|
Commercial real estate [Member] | Industrial [Member] |
|
|
Impaired loans [Abstract] |
|
|
Impaired loans, unpaid principal balance |
909
|
|
Impaired loans, recorded investment, total |
909
|
|
Impaired loans, recorded investment with no related allowance |
909
|
|
Impaired loans, recorded investment with related allowance |
0
|
|
Impaired loans, related allowance |
0
|
|
Impaired loans, average recorded investment |
454
|
|
Impaired loans, interest income recognized |
0
|
|
Commercial real estate [Member] | Other commercial real estate [Member] |
|
|
Impaired loans [Abstract] |
|
|
Impaired loans, unpaid principal balance |
801
|
|
Impaired loans, recorded investment, total |
641
|
|
Impaired loans, recorded investment with no related allowance |
641
|
|
Impaired loans, recorded investment with related allowance |
0
|
|
Impaired loans, related allowance |
0
|
|
Impaired loans, average recorded investment |
666
|
|
Impaired loans, interest income recognized |
0
|
|
Loans to individuals [Member] | Permanent residential mortgage [Member] |
|
|
Impaired loans [Abstract] |
|
|
Impaired loans, unpaid principal balance |
24,868
|
|
Impaired loans, recorded investment, total |
20,441
|
|
Impaired loans, recorded investment with no related allowance |
20,441
|
|
Impaired loans, recorded investment with related allowance |
0
|
|
Impaired loans, related allowance |
0
|
|
Impaired loans, average recorded investment |
22,196
|
|
Impaired loans, interest income recognized |
1,198
|
|
Loans to individuals [Member] | Permanent residential mortgage [Member] | US Government Agency Insured Loans |
|
|
Impaired loans [Abstract] |
|
|
Impaired loans, unpaid principal balance |
204,187
|
[1] |
Impaired loans, recorded investment, total |
197,794
|
[1] |
Impaired loans, recorded investment with no related allowance |
197,794
|
[1] |
Impaired loans, recorded investment with related allowance |
0
|
[1] |
Impaired loans, related allowance |
0
|
[1] |
Impaired loans, average recorded investment |
195,009
|
[1] |
Impaired loans, interest income recognized |
7,733
|
[1] |
Loans to individuals [Member] | Home Equity Loan |
|
|
Impaired loans [Abstract] |
|
|
Impaired loans, unpaid principal balance |
12,967
|
|
Impaired loans, recorded investment, total |
11,081
|
|
Impaired loans, recorded investment with no related allowance |
11,081
|
|
Impaired loans, recorded investment with related allowance |
0
|
|
Impaired loans, related allowance |
0
|
|
Impaired loans, average recorded investment |
10,776
|
|
Impaired loans, interest income recognized |
0
|
|
Loans to individuals [Member] | Residential Mortgage [Member] |
|
|
Impaired loans [Abstract] |
|
|
Impaired loans, unpaid principal balance |
242,022
|
|
Impaired loans, recorded investment, total |
229,316
|
|
Impaired loans, recorded investment with no related allowance |
229,316
|
|
Impaired loans, recorded investment with related allowance |
0
|
|
Impaired loans, related allowance |
0
|
|
Impaired loans, average recorded investment |
227,981
|
|
Impaired loans, interest income recognized |
8,931
|
|
Loans to individuals [Member] | Personal [Member] |
|
|
Impaired loans [Abstract] |
|
|
Impaired loans, unpaid principal balance |
360
|
|
Impaired loans, recorded investment, total |
287
|
|
Impaired loans, recorded investment with no related allowance |
287
|
|
Impaired loans, recorded investment with related allowance |
0
|
|
Impaired loans, related allowance |
0
|
|
Impaired loans, average recorded investment |
259
|
|
Impaired loans, interest income recognized |
$ 0
|
|
|
|