Loans Receivable, Net - Credit Grades and Risk Characteristics (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	$ 989,440	$ 1,496,628
Financing receivable, year two, originated, fiscal year before current fiscal year	1,322,535	1,313,707
Financing receivable, year three, originated, two years before current fiscal year	1,195,847	817,607
Financing receivable, year four, originated, three years before current fiscal year	684,677	800,731
Financing receivable, year five, originated, four years before current fiscal year	701,293	620,952
Financing receivable, originated, more than five years before current fiscal year	2,501,792	2,340,571
Financing receivable, revolving	425,206	365,910
Total	7,820,790	7,756,106
Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	89,195	137,993
Financing receivable, year two, originated, fiscal year before current fiscal year	38,285	42,604
Financing receivable, year three, originated, two years before current fiscal year	36,320	30,036
Financing receivable, year four, originated, three years before current fiscal year	23,008	21,076
Financing receivable, year five, originated, four years before current fiscal year	12,749	34,914
Financing receivable, originated, more than five years before current fiscal year	85,928	61,163
Financing receivable, revolving	189,434	142,870
Total	474,919	470,656
Commercial and industrial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	89,195	137,262
Financing receivable, year two, originated, fiscal year before current fiscal year	37,402	40,737
Financing receivable, year three, originated, two years before current fiscal year	33,466	27,967
Financing receivable, year four, originated, three years before current fiscal year	21,560	18,845
Financing receivable, year five, originated, four years before current fiscal year	12,478	33,568
Financing receivable, originated, more than five years before current fiscal year	83,544	59,339
Financing receivable, revolving	179,549	134,140
Total	457,194	451,858
Commercial and industrial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	0	150
Financing receivable, year two, originated, fiscal year before current fiscal year	249	583
Financing receivable, year three, originated, two years before current fiscal year	249	826
Financing receivable, year four, originated, three years before current fiscal year	586	1,422
Financing receivable, year five, originated, four years before current fiscal year	125	907
Financing receivable, originated, more than five years before current fiscal year	925	118
Financing receivable, revolving	3,193	1,429
Total	5,327	5,435
Commercial and industrial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	0	581
Financing receivable, year two, originated, fiscal year before current fiscal year	634	1,284
Financing receivable, year three, originated, two years before current fiscal year	2,605	1,243
Financing receivable, year four, originated, three years before current fiscal year	862	809
Financing receivable, year five, originated, four years before current fiscal year	146	439
Financing receivable, originated, more than five years before current fiscal year	1,459	1,706
Financing receivable, revolving	6,692	7,301
Total	12,398	13,363
Commercial real estate – owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	45,807	96,888
Financing receivable, year two, originated, fiscal year before current fiscal year	71,930	152,688
Financing receivable, year three, originated, two years before current fiscal year	137,734	140,203
Financing receivable, year four, originated, three years before current fiscal year	130,008	128,477
Financing receivable, year five, originated, four years before current fiscal year	98,067	125,056
Financing receivable, originated, more than five years before current fiscal year	527,875	481,743
Financing receivable, revolving	34,093	20,010
Total	1,045,514	1,145,065
Commercial real estate – owner occupied | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	45,807	96,888
Financing receivable, year two, originated, fiscal year before current fiscal year	71,930	114,506
Financing receivable, year three, originated, two years before current fiscal year	118,510	122,962
Financing receivable, year four, originated, three years before current fiscal year	117,793	124,050
Financing receivable, year five, originated, four years before current fiscal year	93,660	104,264
Financing receivable, originated, more than five years before current fiscal year	461,360	428,423
Financing receivable, revolving	33,331	18,932
Total	942,391	1,010,025
Commercial real estate – owner occupied | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	0	0
Financing receivable, year two, originated, fiscal year before current fiscal year	0	3,512
Financing receivable, year three, originated, two years before current fiscal year	4,852	8,240
Financing receivable, year four, originated, three years before current fiscal year	3,409	1,023
Financing receivable, year five, originated, four years before current fiscal year	1,733	17,115
Financing receivable, originated, more than five years before current fiscal year	29,810	17,811
Financing receivable, revolving	293	439
Total	40,097	48,140
Commercial real estate – owner occupied | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	0	0
Financing receivable, year two, originated, fiscal year before current fiscal year	0	34,670
Financing receivable, year three, originated, two years before current fiscal year	14,372	9,001
Financing receivable, year four, originated, three years before current fiscal year	8,806	3,404
Financing receivable, year five, originated, four years before current fiscal year	2,674	3,677
Financing receivable, originated, more than five years before current fiscal year	36,705	35,509
Financing receivable, revolving	469	639
Total	63,026	86,900
Commercial real estate – investor
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	563,217	640,241
Financing receivable, year two, originated, fiscal year before current fiscal year	665,501	653,631
Financing receivable, year three, originated, two years before current fiscal year	648,925	336,148
Financing receivable, year four, originated, three years before current fiscal year	304,363	458,715
Financing receivable, year five, originated, four years before current fiscal year	436,138	297,584
Financing receivable, originated, more than five years before current fiscal year	1,018,366	904,260
Financing receivable, revolving	199,720	200,885
Total	3,836,230	3,491,464
Commercial real estate – investor | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	563,217	635,930
Financing receivable, year two, originated, fiscal year before current fiscal year	661,190	628,435
Financing receivable, year three, originated, two years before current fiscal year	593,559	317,104
Financing receivable, year four, originated, three years before current fiscal year	286,315	426,268
Financing receivable, year five, originated, four years before current fiscal year	409,720	281,876
Financing receivable, originated, more than five years before current fiscal year	944,756	812,062
Financing receivable, revolving	192,820	194,913
Total	3,651,577	3,296,588
Commercial real estate – investor | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	0	0
Financing receivable, year two, originated, fiscal year before current fiscal year	0	15,979
Financing receivable, year three, originated, two years before current fiscal year	25,823	17,113
Financing receivable, year four, originated, three years before current fiscal year	17,113	15,225
Financing receivable, year five, originated, four years before current fiscal year	5,321	4,234
Financing receivable, originated, more than five years before current fiscal year	34,150	55,872
Financing receivable, revolving	0	149
Total	82,407	108,572
Commercial real estate – investor | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	0	4,311
Financing receivable, year two, originated, fiscal year before current fiscal year	4,311	9,217
Financing receivable, year three, originated, two years before current fiscal year	29,543	1,931
Financing receivable, year four, originated, three years before current fiscal year	935	17,222
Financing receivable, year five, originated, four years before current fiscal year	21,097	11,474
Financing receivable, originated, more than five years before current fiscal year	39,460	36,326
Financing receivable, revolving	6,900	5,823
Total	102,246	86,304
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total	2,464,127	2,648,921
Consumer | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	277,679	596,552
Financing receivable, year two, originated, fiscal year before current fiscal year	525,038	438,125
Financing receivable, year three, originated, two years before current fiscal year	350,770	227,924
Financing receivable, year four, originated, three years before current fiscal year	163,641	166,994
Financing receivable, year five, originated, four years before current fiscal year	133,111	146,683
Financing receivable, originated, more than five years before current fiscal year	718,306	733,181
Financing receivable, revolving	0	0
Total	2,168,545	2,309,459
Consumer | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	13,542	24,954
Financing receivable, year two, originated, fiscal year before current fiscal year	21,781	26,659
Financing receivable, year three, originated, two years before current fiscal year	22,098	83,296
Financing receivable, year four, originated, three years before current fiscal year	63,657	25,469
Financing receivable, year five, originated, four years before current fiscal year	21,228	16,715
Financing receivable, originated, more than five years before current fiscal year	151,317	160,224
Financing receivable, revolving	1,959	2,145
Total	295,582	339,462
Consumer | Pass | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	277,679	595,982
Financing receivable, year two, originated, fiscal year before current fiscal year	525,038	437,593
Financing receivable, year three, originated, two years before current fiscal year	350,770	226,435
Financing receivable, year four, originated, three years before current fiscal year	163,641	166,773
Financing receivable, year five, originated, four years before current fiscal year	132,890	146,237
Financing receivable, originated, more than five years before current fiscal year	714,785	729,037
Financing receivable, revolving	0	0
Total	2,164,803	2,302,057
Consumer | Pass | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	13,542	24,954
Financing receivable, year two, originated, fiscal year before current fiscal year	21,781	26,659
Financing receivable, year three, originated, two years before current fiscal year	22,044	83,296
Financing receivable, year four, originated, three years before current fiscal year	63,640	25,469
Financing receivable, year five, originated, four years before current fiscal year	21,228	16,565
Financing receivable, originated, more than five years before current fiscal year	147,750	156,276
Financing receivable, revolving	1,959	2,145
Total	291,944	335,364
Consumer | Special Mention | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	0	0
Financing receivable, year two, originated, fiscal year before current fiscal year	0	532
Financing receivable, year three, originated, two years before current fiscal year	0	0
Financing receivable, year four, originated, three years before current fiscal year	0	0
Financing receivable, year five, originated, four years before current fiscal year	0	446
Financing receivable, originated, more than five years before current fiscal year	1,586	2,186
Financing receivable, revolving	0	0
Total	1,586	3,164
Consumer | Special Mention | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	0	0
Financing receivable, year two, originated, fiscal year before current fiscal year	0	0
Financing receivable, year three, originated, two years before current fiscal year	0	0
Financing receivable, year four, originated, three years before current fiscal year	0	0
Financing receivable, year five, originated, four years before current fiscal year	0	150
Financing receivable, originated, more than five years before current fiscal year	538	382
Financing receivable, revolving	0	0
Total	538	532
Consumer | Substandard | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	0	570
Financing receivable, year two, originated, fiscal year before current fiscal year	0	0
Financing receivable, year three, originated, two years before current fiscal year	0	1,489
Financing receivable, year four, originated, three years before current fiscal year	0	221
Financing receivable, year five, originated, four years before current fiscal year	221	0
Financing receivable, originated, more than five years before current fiscal year	1,935	1,958
Financing receivable, revolving	0	0
Total	2,156	4,238
Consumer | Substandard | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	0	0
Financing receivable, year two, originated, fiscal year before current fiscal year	0	0
Financing receivable, year three, originated, two years before current fiscal year	54	0
Financing receivable, year four, originated, three years before current fiscal year	17	0
Financing receivable, year five, originated, four years before current fiscal year	0	0
Financing receivable, originated, more than five years before current fiscal year	3,029	3,566
Financing receivable, revolving	0	0
Total	$ 3,100	$ 3,566